Error creating bean

[iamiqbal.m Mohiuddin]

Hello All:

I am running into strange problem.

 org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'batchProcessor' defined in file [C:\src\wkspc1\MSTDealRefactor\FFD_IHL\Config\Beans.xml]: Can't resolve reference to bean 'sourceBean' while setting property 'sourceBean'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sourceBean' defined in file [C:\src\wkspc1\MSTDealRefactor\FFD_IHL\Config\Beans.xml]: Can't resolve reference to bean 'extractionThread' while setting property 'extractionThread'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'extractionThread' defined in file [C:\src\wkspc1\MSTDealRefactor\FFD_IHL\Config\Beans.xml]: Instantiation of bean failed; nested exception is org.springframework.beans.FatalBeanException: Could not instantiate class [com.mst.batch.jdbc.MSTDataExtractThread]; constructor threw exception; nested exception is java.lang.NullPointerException: null
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sourceBean' defined in file [C:\src\wkspc1\MSTDealRefactor\FFD_IHL\Config\Beans.xml]: Can't resolve reference to bean 'extractionThread' while setting property 'extractionThread'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'extractionThread' defined in file [C:\src\wkspc1\MSTDealRefactor\FFD_IHL\Config\Beans.xml]: Instantiation of bean failed; nested exception is org.springframework.beans.FatalBeanException: Could not instantiate class [com.mst.batch.jdbc.MSTDataExtractThread]; constructor threw exception; nested exception is java.lang.NullPointerException: null
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'extractionThread' defined in file [C:\src\wkspc1\MSTDealRefactor\FFD_IHL\Config\Beans.xml]: Instantiation of bean failed; nested exception is org.springframework.beans.FatalBeanException: Could not instantiate class [com.mst.batch.jdbc.MSTDataExtractThread]; constructor threw exception; nested exception is java.lang.NullPointerException: null
org.springframework.beans.FatalBeanException: Could not instantiate class [com.mst.batch.jdbc.MSTDataExtractThread]; constructor threw exception; nested exception is java.lang.NullPointerException: null   

  

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">

<beans>
	
	<bean id="batchProcessor" class="com.mst.batch.BatchProcessor" singleton="false">
		<property name="batchInitializer"><ref bean="batchInitializer" /></property>
		<property name="sourceBean"><ref bean="sourceBean" /></property>
	</bean>
	
	<bean id="batchInitializer" class="com.mst.batch.process.MSTBatchInitImpl" singleton="false">
		<property name="sourceConfig"><value>MSTDatabase.xml</value></property>
		<property name="destinationConfig"><value>MSTMQConnection.xml</value></property>
	</bean>
	
	<bean id="sourceBean" class="com.mst.batch.source.MSTDBSourceImpl">
		<property name="extractionThread"><ref bean="extractionThread" /></property>
	</bean>

	
		<bean id="extractionThread" class="com.mst.batch.jdbc.MSTDataExtractThread">
			<property name="executor"><ref bean="executor" /></property>
		</bean>
		
	<bean id="executor" class="com.mst.batch.jdbc.MSTSQLExecutor">
		<property name="recordFormatter"><ref bean="recordFormatter" /></property>
	</bean>
	
	<bean id="recordFormatter" class="com.mst.batch.jdbc.XMLRecordFormatterImpl" singleton="false">
		<!--  
		<property name="root"><value></value></property>
		<property name="destination"><ref bean="destination" /></property>
		<property name="row"><value></value></property>
		-->
		<!--    
		<property name="root"><value>ReferralReport</value></property>
		<property name="header"><value>ReportHeader</value></property>
		<property name="headerElements"><value>TotalReferrals</value></property>
		<property name = "headerElementsValues"><value></value></property>
		-->
		<property name="row"><value>Referral</value></property>
		
		<property name="destination"><ref bean="destination" /></property>
		
	</bean>
	<bean id="destination" class="com.mst.batch.destination.XMLAdapterImpl" singleton="false">
		<property name="writerThread"><ref bean="writerThread" /></property>
		<!--  <property name="XSLTFilename"><value></value></property>-->
	</bean>
	
	<bean id="writerThread" class="com.mst.batch.destination.XMLFileCreatorThread" singleton="false">
		<property name="root"><value>ReferralReport</value></property>
		<property name="header"><value>ReportHeader</value></property>
		<property name="headerElements"><value>TotalReferrals</value></property>
		<property name="headerElementsValues"><value></value></property>
		
		<property name="schemaFileName"><value></value></property>
		<!--  <property name="XSLTFilename"><value></value></property>-->
	</bean>

</beans>

package com.mst.batch;

import java.io.File;

import org.apache.log4j.Logger;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.xml.XmlBeanFactory;
import org.springframework.core.io.FileSystemResource;
import org.springframework.core.io.Resource;

public class MSTDealMain extends BatchProcessor {

	static Logger logger = Logger.getLogger("com.mst.batch.MSTDealMain");
	
	private BatchProcessor batchProcessor;
	
	public static void main(String args[]) {
		new MSTDealMain().runBatch(args);
	}

	/**
	 * 
	 */
	public void runBatch(String args[]) {

		try {
			BeanFactory factory = initializeDependentObjects(args);
			//BatchProcessor batchProcessor = new BatchProcessor();
			BatchProcessor batchProcessor = (BatchProcessor)factory.getBean("batchProcessor");
			batchProcessor.runBatch(args);
			//getBatchProcessor().runBatch(args);
		} catch (Exception ex) {
			logger.error("Exception during init / batch run ",ex);
		}
	}

	/**
	 * 
	 * @param args
	 */
	private BeanFactory initializeDependentObjects(String args[]) {
		BeanFactory factory = null;
		try {
			logger.info("Initialize dependent objects ");
			Resource res = new FileSystemResource(args[1] + File.separator
					+ File.separator +"Config"+ File.separator
					+ File.separator+ "Beans.xml");
//			ClassPathResource res = new
//			 ClassPathResource("spring-beans.xml");
			if (res != null) {
				factory = new XmlBeanFactory(res);
				// MSTXMLParser.getInstance().getBatch().setFactory(factory);
			}
		} catch (Exception ex) {
			logger.error(
					"Exception during initialization of dependent objects", ex);
		}
		return factory;
	}

	public BatchProcessor getBatchProcessor() {
		return batchProcessor;
	}

	public void setBatchProcessor(BatchProcessor batchProcessor) {
		this.batchProcessor = batchProcessor;
	}
	
	
	

}


package com.mst.batch;


/**
 * This is the main base class for extraction batch jobs.
 * 
 * @
 * 
 */
public class BatchProcessor {

	Thread tempThread = null;
	static Logger logger = Logger.getLogger("com.mst.batch.BatchProcessor");

	private MSTSourceIntf sourceBean;
	
	private MSTBatchInitIntf batchInitializer;
	
	public BatchProcessor(){
		
	}
	public void runBatch(String args[]) {

		try {

			//BatchProcessor batchProcessor = new BatchProcessor();
			System.out.println("Batch processor");
			int numOfThreadsThtCanBeChkedOut = -1;

			MSTDatabaseManagerImpl mstDatabaseManagerImpl = null;
			Map<String, MSTDataExtractVO> checkOutMap = null;

			MSTXMLParser mstXmlParser = MSTXMLParser.getInstance();
			
			//BeanFactory factory = initializeDependentObjects(args);
			
			// call init here
			getBatchInitializer().initializeBatch(args);
                                               ...............
                                                 .........
                                                ........ // some more code here
                                              getSourceBean().extractData(params);
                                              }

	public MSTSourceIntf getSourceBean() {
		//return (MSTSourceIntf)MSTXMLParser.getInstance().getBatch().getBeanFactory().getBean("sourceBean");
		return sourceBean;
	}
	public void setSourceBean(MSTSourceIntf sourceBean) {
		this.sourceBean = sourceBean;
	}
	public void setBatchInitializer(MSTBatchInitIntf batchInitializer) {
		this.batchInitializer = batchInitializer;
	}
		public MSTBatchInitIntf getBatchInitializer() {
		return batchInitializer;
	}
}

  

I am getting the above exception. I see i am able to get batchInitializer bean but not the sourceBean.
Any help is highly appreciated.

[Mark Spritzler]

Could not instantiate class [com.mst.batch.jdbc.MSTDataExtractThread]; constructor threw exception; nested exception is java.lang.NullPointerException: null

That is your error.

The funny thing about Spring exceptions is that unlike other exception reading. It is best to start at the bottom and get the root exception, and that will tell you what is wrong

So in the constructor of MSTDataExtractThread class you are getting a NullPointerException.

Mark

[iamiqbal.m Mohiuddin]

Thanks for the reply.

I am not sure why its an issue in the constructor of MSTDatExtrachThread class.

If i change tthe spring beans configuration by removing sourceBean as reference proprty and put it as an isolated bean and get that bean through Bean factory
it works without any error.

<bean id="batchProcessor" class="com.mst.batch.BatchProcessor" singleton="false">
<property name="batchInitializer"><ref bean="batchInitializer" /></property>
<property name="sourceBean"><ref bean="sourceBean" /></property> </bean>

and in code:

   sourceBean = beanFactory.getBean("sourceBean") 
            sourceBean.methodCall();

This works but not the original one which i have posted.

Appreciate if anyone can put some light on this.