archana gangaiah

I have to decide between this below scerenio

1. Multiple threads in single class
2. Multiple threads in multiple class

Please let me know which of the above option is more efficient way

Thanks in advance,
Archana

Here is the code that worked for me. If you want the cell to be editable use EditTextCell otherwise use TextCell

CellTable<MessageEvent> cellTable= new CellTable<MessageEvent>(); private final void createEditWorkflows(List<MessageEvent> theWorkflowMessageEvents, boolean isSelectAll) { // status Column<MessageEvent, String> status = new Column<MessageEvent, String>(new EditTextCell()) { @Override public String getValue(MessageEvent workflowMessageEvent) { return workflowMessageEvent.getStatus(); } }; cellTable.addColumn(status); status.setFieldUpdater(new FieldUpdater<MessageEvent, String>() { public void update(int index, MessageEvent object, String value) { // Called when the user changes the value. object.setStatus(value); } }); cellTable.setRowCount(theWorkflowMessageEvents.size(), true); // Push the data into the widget. celTable.setRowData(0, theWorkflowMessageEvents); }

I apologize for cross posting. I assure you that this will never happen in future.

here is the code I tried to make the flextable's cell editable using the below code .The flex table is loaded with db values, when user clicks on the cell of flextable, it has to become editable and the user entered value has to be stored in db after he clicks submit button which is present in each row.

I'm using EditTextCell(), to make the cell editable but it not reflecting when I test it. I have included all my codes below. Please let me know , if i'm missing anything.


private List<PendingChange<?>> pendingChanges = new ArrayList<PendingChange<?>>(); private List<AbstractEditableCell<?, ?>> editableCells = new ArrayList<AbstractEditableCell<?, ?>>(); CellTable cellTable= new CellTable<MessageEvent>(); EditTextCell editCell = new EditTextCell(); protected FlexTable flextable; //flextable creation private final void createWorkflows(List<MessageEvent> theWorkflowMessageEvents, boolean isSelectAll) { int row = 1; if (theWorkflowMessageEvents != null) { for (final MessageEvent workflowMessageEvent : theWorkflowMessageEvents) { flextable.getRowFormatter().setStyleName(row,ACTIVE_COLLECTION); flextable.getCellFormatter().setHorizontalAlignment(row, 0, HasHorizontalAlignment.ALIGN_LEFT); flextable.getCellFormatter().setWordWrap(row, 0, false); flextable.setText(row, 0, workflowMessageEvent.getTransferReceived()); flextable.getCellFormatter().setHorizontalAlignment(row, 1, HasHorizontalAlignment.ALIGN_LEFT); flextable.getCellFormatter().setWordWrap(row, 1, false); flextable.setText(row, 1, workflowMessageEvent.getLoadReceived()); makeFlexTableEditable() ; Button submitButton= new Button("Submit"); flextable.getCellFormatter().setHorizontalAlignment(row, 3, HasHorizontalAlignment.ALIGN_LEFT); flextable.getCellFormatter().setWordWrap(row, 3, false); flextable.setWidget(row, 3,submitButton ); submitWorklow(submitButton,row, workflowMessageEvent); flextable.getRowFormatter().setVisible(row, true); row++; } } } //adding flextable to main panel protected void displayPendingWorkflows(final List<MessageEvent> theWorkflowMessageEvents) { this.createPendingWorkflows(theWorkflowMessageEvents, false); //some code mainPanel.add(flextable); mainPanel.add(cellTable); } //code for making flex table editable for TransferReceived column private void makeFlexTableEditable() { addColumn(new EditTextCell(), new GetValue() { @Override public String getValue(MessageEvent workflowMessageEvent) { return workflowMessageEvent.getTransferReceived(); } }, new FieldUpdater<MessageEvent, String>() { public void update(int index, MessageEvent workflowMessageEvent, String value) { try { pendingChanges.add(new TransferReceived(workflowMessageEvent, value)); }catch (Exception e) { } } }); }

private <C> Column<MessageEvent, String> addColumn(EditTextCell cell, final GetValue<String> getter,FieldUpdater<MessageEvent, String> fieldUpdater) { Column<MessageEvent, String> transColumn = new Column<MessageEvent, String>(cell){ @Override public String getValue(MessageEvent object) { return getter.getValue(object); } }; transColumn.setFieldUpdater(fieldUpdater); if (cell instanceof AbstractEditableCell<?, ?>) { editableCells.add((AbstractEditableCell<?, ?>) cell); } cellTable.addColumn(transColumn); return transColumn; } /** * A pending change to a {@link MessageEvent}. Changes aren't committed * immediately to illustrate that cells can remember their pending changes. * * @param <T> the data type being changed */ private abstract static class PendingChange<T> { private final MessageEvent message; private final T value; public PendingChange(MessageEvent message, T value) { this.message = message; this.value = value; } /** * Commit the change to the contact. */ public void commit() { doCommit(message, value); } /** * Update the appropriate field in the . * * @param message to update * @param value the new value */ protected abstract void doCommit(MessageEvent message, T value); } /** * Updates the Transfered Received. */ private static class TransferReceived extends PendingChange<String> { public TransferReceived(MessageEvent message, String value) { super(message, value); } @Override protected void doCommit(MessageEvent message, String value) { message.setTransferReceived(value); } } /** * Get a cell value from a record. * * @param <C> the cell type */ private static interface GetValue<C> { C getValue(MessageEvent message); }

I'm novice to GWT. I want to implement the below scenerio

when a user clicks a edit button, all the cell in that row of FlexTable should become editable after that when user clicks store button, the user entered value should be stored into database. Please help me how to start.. I have included some code snippet but I dont think this will work

private void editbutton(Button editButton) { editButton.addClickHandler( new ClickHandler() { public void onClick(ClickEvent theClickEvent) { //edit(Cell.Context context, Element parent, java.lang.String value) Column<LTCMessageEvent, String> editableColumn = new Column<LTCMessageEvent, String>( new EditTextCell()) { public String getValue(LTCMessageEvent parameter) { String name= parameter.toString(); return name; } }; } });

I'm getting below error in error log after I build my project using Ant

Problems occurred when invoking code from plug-in: "org.eclipse.core.resources".
Exception Stack Trace:
java.lang.NullPointerException
at com.google.gdt.eclipse.core.MarkerUtilities.createMarker(MarkerUtilities.java:66)
at com.google.gdt.eclipse.core.MarkerUtilities.createQuickFixMarker(MarkerUtilities.java:100)
at com.google.gdt.eclipse.core.validators.WebAppProjectValidator.validateBuildClasspath(WebAppProjectValidator.java:143)
at com.google.gdt.eclipse.core.validators.WebAppProjectValidator.build(WebAppProjectValidator.java:101)
at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:629)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:172)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:203)
at org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:255)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:258)
at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:311)
at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:343)
at org.eclipse.core.internal.resources.Workspace.build(Workspace.java:344)
at org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:825)
at org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:702)
at org.eclipse.debug.internal.ui.DebugUIPlugin.buildAndLaunch(DebugUIPlugin.java:923)
at org.eclipse.debug.internal.ui.DebugUIPlugin$8.run(DebugUIPlugin.java:1126)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)



Session Data:


eclipse.buildId=M20100909-0800
java.version=1.6.0_26
java.vendor=Sun Microsystems Inc.
BootLoader constants: OS=win32, ARCH=x86, WS=win32, NL=en_US
Framework arguments: -product org.eclipse.epp.package.jee.product
Command-line arguments: -os win32 -ws win32 -arch x86 -product org.eclipse.epp.package.jee.product

I surfed in google but i didnt proper solution for this. Please help me out.


Thanks in advance.

I forgot to comment that line while posting ... It is working..... Thanks for pointing out

Actually, I was trying to insert too big value for that column's datatype scale....:-)

I'm using oracle 10g.

I am trying to get the sum of count of a column based on some collection column which is passed at run time using preparedStatement.
here is my code. The query works fine in sqldeveloper.

public int publishCcollectionCountOfRelationship(List<String> collections) {int temp=0; List<Integer> count= new ArrayList<Integer>(); List<Date> date= new ArrayList<Date>(); List<String> collection1= new ArrayList<String>(); try{ Driver d1 = (Driver)Class.forName(DBDRIVER).newInstance(); DriverManager.registerDriver(d1); Connection conn = DriverManager.getConnection(URI, USER, PASSWORD); ResultSet resultSets =null; PreparedStatement pstmt; String query =" select sum(rel_count) from erd_workflow.PUBLISH_FILE_TRACKER p, erd_workflow.ltc_load_tracker l where p.collection= ? " +" and l.received_date = '01-jun-11' "; System.out.println("query :"+query); for(String collection: collections){ pstmt= conn.prepareStatement(query); pstmt.setString(1 , collection); System.out.println("collction"+collection); resultSets = pstmt.executeQuery(); if(resultSets.next()) { System.out.println("collection1 :"+resultSets.getInt(1) ); count.add(resultSets.getInt(1)); collection1.add(resultSets.getString(2)); System.out.println("collection1 :" ); } } } catch(Exception e){ System.out.println("Error "+ e.getMessage()); } for(int total:count){ temp=total+temp; } System.out.println("RlationShip1 Count basede on document "+ temp); return temp; }
please help me....Thnks in adv

Thanks for your response.It is resolved.


I have used the below FTPClient method.
InputStream is1= ftp. retrieveFileStream(srcpath+destfilename);

Actually i want to parse remote xml file so I have used FTPClient. I am able to connect to the server and but it is not picking me the remote xml file. My problem is it is giving me IO exception( The system cannot find the file specified). I have checked the remote file permission also.

File outDocFile = new File(outputLocation,oct);
outputLocation points to remote loaction (/ct-data/ald/erd/relDeletes/ )
and oct points to the file remote file which I need to parse(entity-N_CCH-61874.xml).
outDocFile.getAbsolutePath() gives me C:\ct-data\ald\erd\relDeletes\entity-N_CCH-61874.xml

I am trying to parse remote xml file. when i check the path of the file using outDocFile.getCanonicalFile() , it is pointing to local("C:/ct-data/ald/erd/relDeletes) but the variable(outputLocation) is pointing to "/ct-data/ald/erd/relDeletes". because of this i'm getting outDocFile.exists() =null

please let me know, if i am missing anything.


here is the code:

String outputLocation= "/ct-data/ald/erd/relDeletes"; String oct= "entity-N_CCH-61874.xml"; try { FTPClient ftp = new FTPClient(); ftp.connect(hostName); ftp.login(username,password); ftp.setFileType(FTP.BINARY_FILE_TYPE); // ftp.changeWorkingDirectory("/ct-data/ald/erd/relDeletes"); int reply = ftp.getReplyCode(); System.out.println("Received Reply from FTP Connection:" + reply); if(FTPReply.isPositiveCompletion(reply)){ System.out.println("Connected Success"); } System.out.print("outputfile "+oct+ "\n"+outputLocation+"\n"); File outDocFile = new File(outputLocation,oct); System.out.println("File path"+outDocFile.getCanonicalFile()); if(outDocFile.exists() ) { InputStream stream= new FileInputStream(outDocFile); DeleteFileParser del = new DeleteFileParser(entityWriters, relWriters, batchID, oct, fmConfig); del.setInput(stream); del.parse(); System.out.println("parsing done"); } } catch(Exception e) { System.out.println("Exception" +e.getMessage()); }


output:


Received Reply from FTP Connection:200
Connected Success
outputfile entity-N_CCH-61874.xml
/ct-data/ald/erd/relDeletes/
File path C:\ct-data\ald\erd\relDeletes\entity-N_CCH-61874.xml



Thanks in advance

Thanks for your reply. I tried the same.. it is working fine now.

I am getting the below error while starting the tomcat server.I had checked that there is nothing in tomcat-users.xml . Might be this is causing the issue. Please help me to resolve this issue.

Apr 14, 2011 9:45:57 AM org.apache.tomcat.util.digester.Digester fatalError SEVERE: Parse Fatal Error at line -1 column -1: Premature end of file. org.xml.sax.SAXParseException: Premature end of file. at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(Unknown Source) at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.fatalError(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLVersionDetector.determineDocVersion(Unknown Source) at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source) at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source) at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source) at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Unknown Source) at org.apache.tomcat.util.digester.Digester.parse(Digester.java:1580) at org.apache.catalina.users.MemoryUserDatabase.open(MemoryUserDatabase.java:370) at org.apache.catalina.users.MemoryUserDatabaseFactory.getObjectInstance(MemoryUserDatabaseFactory.java:97) at org.apache.naming.factory.ResourceFactory.getObjectInstance(ResourceFactory.java:129) at javax.naming.spi.NamingManager.getObjectInstance(Unknown Source) at org.apache.naming.NamingContext.lookup(NamingContext.java:792) at org.apache.naming.NamingContext.lookup(NamingContext.java:152) at org.apache.catalina.mbeans.GlobalResourcesLifecycleListener.createMBeans(GlobalResourcesLifecycleListener.java:138) at org.apache.catalina.mbeans.GlobalResourcesLifecycleListener.createMBeans(GlobalResourcesLifecycleListener.java:108) at org.apache.catalina.mbeans.GlobalResourcesLifecycleListener.lifecycleEvent(GlobalResourcesLifecycleListener.java:80) at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119) at org.apache.catalina.core.StandardServer.start(StandardServer.java:676) at org.apache.catalina.startup.Catalina.start(Catalina.java:537) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:271) at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:409) Apr 14, 2011 9:45:57 AM org.apache.naming.NamingContext lookup WARNING: Unexpected exception resolving reference org.xml.sax.SAXParseException: Premature end of file. at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Unknown Source) at org.apache.tomcat.util.digester.Digester.parse(Digester.java:1580) at org.apache.catalina.users.MemoryUserDatabase.open(MemoryUserDatabase.java:370) at org.apache.catalina.users.MemoryUserDatabaseFactory.getObjectInstance(MemoryUserDatabaseFactory.java:97) at org.apache.naming.factory.ResourceFactory.getObjectInstance(ResourceFactory.java:129) at javax.naming.spi.NamingManager.getObjectInstance(Unknown Source) at org.apache.naming.NamingContext.lookup(NamingContext.java:792) at org.apache.naming.NamingContext.lookup(NamingContext.java:152) at org.apache.catalina.mbeans.GlobalResourcesLifecycleListener.createMBeans(GlobalResourcesLifecycleListener.java:138) at org.apache.catalina.mbeans.GlobalResourcesLifecycleListener.createMBeans(GlobalResourcesLifecycleListener.java:108) at org.apache.catalina.mbeans.GlobalResourcesLifecycleListener.lifecycleEvent(GlobalResourcesLifecycleListener.java:80) at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119) at org.apache.catalina.core.StandardServer.start(StandardServer.java:676) at org.apache.catalina.startup.Catalina.start(Catalina.java:537) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:271) at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:409) Apr 14, 2011 9:45:57 AM org.apache.catalina.mbeans.GlobalResourcesLifecycleListener createMBeans SEVERE: Exception processing Global JNDI Resources javax.naming.NamingException: Premature end of file. at org.apache.naming.NamingContext.lookup(NamingContext.java:804) at org.apache.naming.NamingContext.lookup(NamingContext.java:152) at org.apache.catalina.mbeans.GlobalResourcesLifecycleListener.createMBeans(GlobalResourcesLifecycleListener.java:138) at org.apache.catalina.mbeans.GlobalResourcesLifecycleListener.createMBeans(GlobalResourcesLifecycleListener.java:108) at org.apache.catalina.mbeans.GlobalResourcesLifecycleListener.lifecycleEvent(GlobalResourcesLifecycleListener.java:80) at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119) at org.apache.catalina.core.StandardServer.start(StandardServer.java:676) at org.apache.catalina.startup.Catalina.start(Catalina.java:537) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:271) at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:409) Apr 14, 2011 9:45:57 AM org.apache.catalina.core.StandardService start INFO: Starting service Catalina Apr 14, 2011 9:45:57 AM org.apache.catalina.core.StandardEngine start INFO: Starting Servlet Engine: Apache Tomcat/5.5.9 Apr 14, 2011 9:45:57 AM org.apache.tomcat.util.digester.Digester fatalError SEVERE: Parse Fatal Error at line -1 column -1: Premature end of file. org.xml.sax.SAXParseException: Premature end of file. at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(Unknown Source) at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.fatalError(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLVersionDetector.determineDocVersion(Unknown Source) at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source) at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source) at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source) at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Unknown Source) at org.apache.tomcat.util.digester.Digester.parse(Digester.java:1580) at org.apache.catalina.users.MemoryUserDatabase.open(MemoryUserDatabase.java:370) at org.apache.catalina.users.MemoryUserDatabaseFactory.getObjectInstance(MemoryUserDatabaseFactory.java:97) at org.apache.naming.factory.ResourceFactory.getObjectInstance(ResourceFactory.java:129) at javax.naming.spi.NamingManager.getObjectInstance(Unknown Source) at org.apache.naming.NamingContext.lookup(NamingContext.java:792) at org.apache.naming.NamingContext.lookup(NamingContext.java:152) at org.apache.catalina.realm.UserDatabaseRealm.start(UserDatabaseRealm.java:222) at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1004) at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:442) at org.apache.catalina.core.StandardService.start(StandardService.java:450) at org.apache.catalina.core.StandardServer.start(StandardServer.java:683) at org.apache.catalina.startup.Catalina.start(Catalina.java:537) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:271) at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:409) Apr 14, 2011 9:45:57 AM org.apache.naming.NamingContext lookup WARNING: Unexpected exception resolving reference org.xml.sax.SAXParseException: Premature end of file. at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Unknown Source) at org.apache.tomcat.util.digester.Digester.parse(Digester.java:1580) at org.apache.catalina.users.MemoryUserDatabase.open(MemoryUserDatabase.java:370) at org.apache.catalina.users.MemoryUserDatabaseFactory.getObjectInstance(MemoryUserDatabaseFactory.java:97) at org.apache.naming.factory.ResourceFactory.getObjectInstance(ResourceFactory.java:129) at javax.naming.spi.NamingManager.getObjectInstance(Unknown Source) at org.apache.naming.NamingContext.lookup(NamingContext.java:792) at org.apache.naming.NamingContext.lookup(NamingContext.java:152) at org.apache.catalina.realm.UserDatabaseRealm.start(UserDatabaseRealm.java:222) at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1004) at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:442) at org.apache.catalina.core.StandardService.start(StandardService.java:450) at org.apache.catalina.core.StandardServer.start(StandardServer.java:683) at org.apache.catalina.startup.Catalina.start(Catalina.java:537) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:271) at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:409) Apr 14, 2011 9:45:57 AM org.apache.catalina.realm.UserDatabaseRealm start SEVERE: Exception looking up UserDatabase under key UserDatabase javax.naming.NamingException: Premature end of file. at org.apache.naming.NamingContext.lookup(NamingContext.java:804) at org.apache.naming.NamingContext.lookup(NamingContext.java:152) at org.apache.catalina.realm.UserDatabaseRealm.start(UserDatabaseRealm.java:222) at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1004) at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:442) at org.apache.catalina.core.StandardService.start(StandardService.java:450) at org.apache.catalina.core.StandardServer.start(StandardServer.java:683) at org.apache.catalina.startup.Catalina.start(Catalina.java:537) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:271) at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:409) Apr 14, 2011 9:45:57 AM org.apache.catalina.startup.Catalina start SEVERE: Catalina.start: LifecycleException: No UserDatabase component found under key UserDatabase at org.apache.catalina.realm.UserDatabaseRealm.start(UserDatabaseRealm.java:230) at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1004) at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:442) at org.apache.catalina.core.StandardService.start(StandardService.java:450) at org.apache.catalina.core.StandardServer.start(StandardServer.java:683) at org.apache.catalina.startup.Catalina.start(Catalina.java:537) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:271) at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:409) Apr 14, 2011 9:45:57 AM org.apache.catalina.startup.Catalina start INFO: Server startup in 67 ms

I am getting the below error while starting up the remote Tomcat server 5.5.9 (which is installed in remote server). I had checked the tomcat-users.xml which is empty.I really dont know how it has become empty. Please help me.
SEVERE: Parse Fatal Error at line -1 column -1: Premature end of file. org.xml.sax.SAXParseException: Premature end of file. at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(Unknown Source) at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.fatalError(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLVersionDetector.determineDocVersion(Unknown Source) at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source) at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source) at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source) at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Unknown Source) at org.apache.tomcat.util.digester.Digester.parse(Digester.java:1580) at org.apache.catalina.users.MemoryUserDatabase.open(MemoryUserDatabase.java:370) at org.apache.catalina.users.MemoryUserDatabaseFactory.getObjectInstance(MemoryUserDatabaseFactory.java:97) at org.apache.naming.factory.ResourceFactory.getObjectInstance(ResourceFactory.java:129) at javax.naming.spi.NamingManager.getObjectInstance(Unknown Source) at org.apache.naming.NamingContext.lookup(NamingContext.java:792) at org.apache.naming.NamingContext.lookup(NamingContext.java:152) at org.apache.catalina.mbeans.GlobalResourcesLifecycleListener.createMBeans(GlobalResourcesLifecycleListener.java:138) at org.apache.catalina.mbeans.GlobalResourcesLifecycleListener.createMBeans(GlobalResourcesLifecycleListener.java:108) at org.apache.catalina.mbeans.GlobalResourcesLifecycleListener.lifecycleEvent(GlobalResourcesLifecycleListener.java:80) at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119) at org.apache.catalina.core.StandardServer.start(StandardServer.java:676) at org.apache.catalina.startup.Catalina.start(Catalina.java:537) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:271) at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:409) Apr 14, 2011 9:45:57 AM org.apache.naming.NamingContext lookup WARNING: Unexpected exception resolving reference org.xml.sax.SAXParseException: Premature end of file. at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Unknown Source) at org.apache.tomcat.util.digester.Digester.parse(Digester.java:1580) at org.apache.catalina.users.MemoryUserDatabase.open(MemoryUserDatabase.java:370) at org.apache.catalina.users.MemoryUserDatabaseFactory.getObjectInstance(MemoryUserDatabaseFactory.java:97) at org.apache.naming.factory.ResourceFactory.getObjectInstance(ResourceFactory.java:129) at javax.naming.spi.NamingManager.getObjectInstance(Unknown Source) at org.apache.naming.NamingContext.lookup(NamingContext.java:792) at org.apache.naming.NamingContext.lookup(NamingContext.java:152) at org.apache.catalina.mbeans.GlobalResourcesLifecycleListener.createMBeans(GlobalResourcesLifecycleListener.java:138) at org.apache.catalina.mbeans.GlobalResourcesLifecycleListener.createMBeans(GlobalResourcesLifecycleListener.java:108) at org.apache.catalina.mbeans.GlobalResourcesLifecycleListener.lifecycleEvent(GlobalResourcesLifecycleListener.java:80) at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119) at org.apache.catalina.core.StandardServer.start(StandardServer.java:676) at org.apache.catalina.startup.Catalina.start(Catalina.java:537) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:271) at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:409) Apr 14, 2011 9:45:57 AM org.apache.catalina.mbeans.GlobalResourcesLifecycleListener createMBeans SEVERE: Exception processing Global JNDI Resources javax.naming.NamingException: Premature end of file. at org.apache.naming.NamingContext.lookup(NamingContext.java:804) at org.apache.naming.NamingContext.lookup(NamingContext.java:152) at org.apache.catalina.mbeans.GlobalResourcesLifecycleListener.createMBeans(GlobalResourcesLifecycleListener.java:138) at org.apache.catalina.mbeans.GlobalResourcesLifecycleListener.createMBeans(GlobalResourcesLifecycleListener.java:108) at org.apache.catalina.mbeans.GlobalResourcesLifecycleListener.lifecycleEvent(GlobalResourcesLifecycleListener.java:80) at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119) at org.apache.catalina.core.StandardServer.start(StandardServer.java:676) at org.apache.catalina.startup.Catalina.start(Catalina.java:537) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:271) at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:409) Apr 14, 2011 9:45:57 AM org.apache.catalina.core.StandardService start INFO: Starting service Catalina Apr 14, 2011 9:45:57 AM org.apache.catalina.core.StandardEngine start INFO: Starting Servlet Engine: Apache Tomcat/5.5.9 Apr 14, 2011 9:45:57 AM org.apache.tomcat.util.digester.Digester fatalError SEVERE: Parse Fatal Error at line -1 column -1: Premature end of file. org.xml.sax.SAXParseException: Premature end of file. at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(Unknown Source) at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.fatalError(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLVersionDetector.determineDocVersion(Unknown Source) at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source) at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source) at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source) at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Unknown Source) at org.apache.tomcat.util.digester.Digester.parse(Digester.java:1580) at org.apache.catalina.users.MemoryUserDatabase.open(MemoryUserDatabase.java:370) at org.apache.catalina.users.MemoryUserDatabaseFactory.getObjectInstance(MemoryUserDatabaseFactory.java:97) at org.apache.naming.factory.ResourceFactory.getObjectInstance(ResourceFactory.java:129) at javax.naming.spi.NamingManager.getObjectInstance(Unknown Source) at org.apache.naming.NamingContext.lookup(NamingContext.java:792) at org.apache.naming.NamingContext.lookup(NamingContext.java:152) at org.apache.catalina.realm.UserDatabaseRealm.start(UserDatabaseRealm.java:222) at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1004) at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:442) at org.apache.catalina.core.StandardService.start(StandardService.java:450) at org.apache.catalina.core.StandardServer.start(StandardServer.java:683) at org.apache.catalina.startup.Catalina.start(Catalina.java:537) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:271) at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:409) Apr 14, 2011 9:45:57 AM org.apache.naming.NamingContext lookup WARNING: Unexpected exception resolving reference org.xml.sax.SAXParseException: Premature end of file. at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Unknown Source) at org.apache.tomcat.util.digester.Digester.parse(Digester.java:1580) at org.apache.catalina.users.MemoryUserDatabase.open(MemoryUserDatabase.java:370) at org.apache.catalina.users.MemoryUserDatabaseFactory.getObjectInstance(MemoryUserDatabaseFactory.java:97) at org.apache.naming.factory.ResourceFactory.getObjectInstance(ResourceFactory.java:129) at javax.naming.spi.NamingManager.getObjectInstance(Unknown Source) at org.apache.naming.NamingContext.lookup(NamingContext.java:792) at org.apache.naming.NamingContext.lookup(NamingContext.java:152) at org.apache.catalina.realm.UserDatabaseRealm.start(UserDatabaseRealm.java:222) at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1004) at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:442) at org.apache.catalina.core.StandardService.start(StandardService.java:450) at org.apache.catalina.core.StandardServer.start(StandardServer.java:683) at org.apache.catalina.startup.Catalina.start(Catalina.java:537) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:271) at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:409) Apr 14, 2011 9:45:57 AM org.apache.catalina.realm.UserDatabaseRealm start SEVERE: Exception looking up UserDatabase under key UserDatabase javax.naming.NamingException: Premature end of file. at org.apache.naming.NamingContext.lookup(NamingContext.java:804) at org.apache.naming.NamingContext.lookup(NamingContext.java:152) at org.apache.catalina.realm.UserDatabaseRealm.start(UserDatabaseRealm.java:222) at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1004) at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:442) at org.apache.catalina.core.StandardService.start(StandardService.java:450) at org.apache.catalina.core.StandardServer.start(StandardServer.java:683) at org.apache.catalina.startup.Catalina.start(Catalina.java:537) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:271) at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:409) Apr 14, 2011 9:45:57 AM org.apache.catalina.startup.Catalina start SEVERE: Catalina.start: LifecycleException: No UserDatabase component found under key UserDatabase at org.apache.catalina.realm.UserDatabaseRealm.start(UserDatabaseRealm.java:230) at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1004) at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:442) at org.apache.catalina.core.StandardService.start(StandardService.java:450) at org.apache.catalina.core.StandardServer.start(StandardServer.java:683) at org.apache.catalina.startup.Catalina.start(Catalina.java:537) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:271) at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:409) Apr 14, 2011 9:45:57 AM org.apache.catalina.startup.Catalina start INFO: Server startup in 67 ms


Thanks in advance