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recognize java system property in xml file

 
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in log4j implementation, the log4j xml parser can recognize a java system property in the xml file such as ${LOGDIR}

i m trying to do the same thing using plain jdk dom parser, but i couldn't make it work. what do i need to do to have DocumentBuilder to recognize a java system property in the xml file.

code snippet. but it throws exception

try {
System.setProperty("ROOTCONFIG", "../app/proj");
DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
String s = "<?xml version=\"1.0\" encoding=\"UTF-8\"?> <!DOCTYPE document [ <!ENTITY mytest SYSTEM '${ROOTCONFIG}/config/externalenv/nonprod/test.xml'>]> <test>&mytest;</test>";
Document doc = dBuilder.parse(new ByteArrayInputStream(s.getBytes()));
catch ( Exception e ) {
e.printStackTrace();
}

here is the exception as ROOTCONFIG is not expanded.

java.net.MalformedURLException: no protocol: ${ROOTCONFIG}/config/externalenv/nonprod/test.xml
at java.net.URL.<init>(Unknown Source)
at java.net.URL.<init>(Unknown Source)
at java.net.URL.<init>(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.setupCurrentEntity(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.startEntity(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.startEntity(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanEntityReference(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(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.DOMParser.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(Unknown Source)
at javax.xml.parsers.DocumentBuilder.parse(Unknown Source)
at com.baml.oms.util.DomTest.testDom(DomTest.java:19)
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.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

 
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i m trying to do the same thing using plain jdk dom parser, but i couldn't make it work. what do i need to do to have DocumentBuilder to recognize a java system property in the xml file.


You could and it is probably the cardinal way is to write your implementation of org.xml.sax.EntityResolver for the purpose, of more or less generality depending on your need and scope of application.

This is one with limited scope of ambition... just enough for the purpose.

You sure can expand the code to take care of all sorts of different setting, not being startsWith etc..., not only ROOTCONFIG etc... It is enough to parse, using regex or string functions, out of the systemId for all sorts of system properties you find interested in using...

In the application, you register the EntityResolver with the DocumentBuilder, like this.


ps As a side-note, not without consequence, it is incorrect to write DOCTYPE document whereas your xml's root is <test>... get it?
 
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