<entity class="com.bs.amg.test.File" name="File" metadata-complete="false">
	<table name="FILES"/>
	<attributes>
		<id name="id">
			<column name="ID" nullable="false"/>
			<generated-value strategy="SEQUENCE" generator="PK_FILES" />
		</id>
		<basic name="URI" optional="true">
			<column name="URI"/>
		</basic>
		<basic name="delimiter" optional="true">
			<column name="DELIMITER"/>
		</basic>
		<basic name="title">
			<column name="IS_TITLE"/>
		</basic>
		<basic name="colCount">
			<column name="COL_COUNT"/>
		</basic>
		<one-to-many name="columns" mapped-by="file" target-entity="com.bs.amg.test.FileColumn" fetch="LAZY">
			<cascade>
				<cascade-refresh/>
			</cascade>
		</one-to-many>
	</attributes>
</entity>

@Stateless
public class Executer
{
    @PersistenceContext( unitName = "main_loader" )
    private EntityManager entityManager;

    private void saveFile( File file )
    {
        PrintWriter printWriter = new PrintWriter( "D:/error_logs.txt" );

	try
	{
		entityManager.persist( file );
	}
	catch( Exception ex )
	{
		ex.printStackTrace( printWriter );
	}
	finally
	{
		printWriter.close();
	}
    }
    
    public void createFile( String URI ) throws Exception
    {
	File file = File.getInstance( URI );
    }
}

    public void createFile( String URI ) throws Exception
    {
	File file = File.getInstance( URI ); // инициализация
        saveFile( file );
    }
}

<persistence-unit name="main_loader" transaction-type="JTA">
	<jta-data-source>java:/orclDS</jta-data-source>
	<properties>
		<property name="hibernate.dialect" value="org.hibernate.dialect.Oracle10gDialect"/>
		<property name="hibernate.hbm2ddl.auto" value="update"/>
		<property name="hibernate.show_sql" value="false"/>
	</properties>
</persistence-unit>

<persistence version="2.0" xmlns="http://java.sun.com/xml/ns/persistence"
			 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
			 xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd">...</persistence >

14:50:39,586 ERROR [org.jboss.ejb3.invocation] (EJB default - 1) JBAS014134: EJB Invocation failed on component CSVBean for method public abstract com.bs.amg.test.File com.bs.amg.test.bean.RemoteCSV.createFile(java.lang.String) throws java.lang.Exception: javax.ejb.EJBException: java.lang.NullPointerException
	at org.jboss.as.ejb3.tx.CMTTxInterceptor.handleExceptionInOurTx(CMTTxInterceptor.java:166) [jboss-as-ejb3-7.1.1.Final.jar:7.1.1.Final]
	at org.jboss.as.ejb3.tx.CMTTxInterceptor.invokeInOurTx(CMTTxInterceptor.java:230) [jboss-as-ejb3-7.1.1.Final.jar:7.1.1.Final]
	at org.jboss.as.ejb3.tx.CMTTxInterceptor.required(CMTTxInterceptor.java:304) [jboss-as-ejb3-7.1.1.Final.jar:7.1.1.Final]
	at org.jboss.as.ejb3.tx.CMTTxInterceptor.processInvocation(CMTTxInterceptor.java:190) [jboss-as-ejb3-7.1.1.Final.jar:7.1.1.Final]
	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.1.Final.jar:1.1.1.Final]
	at org.jboss.as.ejb3.remote.EJBRemoteTransactionPropagatingInterceptor.processInvocation(EJBRemoteTransactionPropagatingInterceptor.java:80) [jboss-as-ejb3-7.1.1.Final.jar:7.1.1.Final]
	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.1.Final.jar:1.1.1.Final]
	at org.jboss.as.ejb3.component.interceptors.CurrentInvocationContextInterceptor.processInvocation(CurrentInvocationContextInterceptor.java:41) [jboss-as-ejb3-7.1.1.Final.jar:7.1.1.Final]
	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.1.Final.jar:1.1.1.Final]
	at org.jboss.as.ejb3.component.interceptors.LoggingInterceptor.processInvocation(LoggingInterceptor.java:59) [jboss-as-ejb3-7.1.1.Final.jar:7.1.1.Final]
	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.1.Final.jar:1.1.1.Final]
	at org.jboss.as.ee.component.NamespaceContextInterceptor.processInvocation(NamespaceContextInterceptor.java:50) [jboss-as-ee-7.1.1.Final.jar:7.1.1.Final]
	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.1.Final.jar:1.1.1.Final]
	at org.jboss.as.ejb3.component.interceptors.AdditionalSetupInterceptor.processInvocation(AdditionalSetupInterceptor.java:43) [jboss-as-ejb3-7.1.1.Final.jar:7.1.1.Final]
	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.1.Final.jar:1.1.1.Final]
	at org.jboss.as.ee.component.TCCLInterceptor.processInvocation(TCCLInterceptor.java:45) [jboss-as-ee-7.1.1.Final.jar:7.1.1.Final]
	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.1.Final.jar:1.1.1.Final]
	at org.jboss.invocation.ChainedInterceptor.processInvocation(ChainedInterceptor.java:61) [jboss-invocation-1.1.1.Final.jar:1.1.1.Final]
	at org.jboss.as.ee.component.ViewService$View.invoke(ViewService.java:165) [jboss-as-ee-7.1.1.Final.jar:7.1.1.Final]
	at org.jboss.as.ejb3.remote.protocol.versionone.MethodInvocationMessageHandler.invokeMethod(MethodInvocationMessageHandler.java:302) [jboss-as-ejb3-7.1.1.Final.jar:7.1.1.Final]
	at org.jboss.as.ejb3.remote.protocol.versionone.MethodInvocationMessageHandler.access$200(MethodInvocationMessageHandler.java:64) [jboss-as-ejb3-7.1.1.Final.jar:7.1.1.Final]
	at org.jboss.as.ejb3.remote.protocol.versionone.MethodInvocationMessageHandler$1.run(MethodInvocationMessageHandler.java:196) [jboss-as-ejb3-7.1.1.Final.jar:7.1.1.Final]
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) [rt.jar:1.7.0_25]
	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334) [rt.jar:1.7.0_25]
	at java.util.concurrent.FutureTask.run(FutureTask.java:166) [rt.jar:1.7.0_25]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [rt.jar:1.7.0_25]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [rt.jar:1.7.0_25]
	at java.lang.Thread.run(Thread.java:724) [rt.jar:1.7.0_25]
	at org.jboss.threads.JBossThread.run(JBossThread.java:122)
Caused by: java.lang.NullPointerException
	at com.bs.amg.test.acting.CSV_Creator.saveFile(CSV_Creator.java:64) [FinalModule-1.0-SNAPSHOT.jar:]
	at com.bs.amg.test.acting.CSV_Creator.createFile(CSV_Creator.java:107) [FinalModule-1.0-SNAPSHOT.jar:]
	at com.bs.amg.test.bean.CSVBean.createFile(CSVBean.java:28) [FinalModule-1.0-SNAPSHOT.jar:]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [rt.jar:1.7.0_25]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) [rt.jar:1.7.0_25]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) [rt.jar:1.7.0_25]
	at java.lang.reflect.Method.invoke(Method.java:606) [rt.jar:1.7.0_25]
	at org.jboss.as.ee.component.ManagedReferenceMethodInterceptorFactory$ManagedReferenceMethodInterceptor.processInvocation(ManagedReferenceMethodInterceptorFactory.java:72) [jboss-as-ee-7.1.1.Final.jar:7.1.1.Final]
	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.1.Final.jar:1.1.1.Final]
	at org.jboss.invocation.WeavedInterceptor.processInvocation(WeavedInterceptor.java:53) [jboss-invocation-1.1.1.Final.jar:1.1.1.Final]
	at org.jboss.as.ee.component.interceptors.UserInterceptorFactory$1.processInvocation(UserInterceptorFactory.java:36) [jboss-as-ee-7.1.1.Final.jar:7.1.1.Final]
	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.1.Final.jar:1.1.1.Final]
	at org.jboss.as.jpa.interceptor.SBInvocationInterceptor.processInvocation(SBInvocationInterceptor.java:47) [jboss-as-jpa-7.1.1.Final.jar:7.1.1.Final]
	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.1.Final.jar:1.1.1.Final]
	at org.jboss.invocation.InitialInterceptor.processInvocation(InitialInterceptor.java:21) [jboss-invocation-1.1.1.Final.jar:1.1.1.Final]
	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.1.Final.jar:1.1.1.Final]
	at org.jboss.invocation.ChainedInterceptor.processInvocation(ChainedInterceptor.java:61) [jboss-invocation-1.1.1.Final.jar:1.1.1.Final]
	at org.jboss.as.ee.component.interceptors.ComponentDispatcherInterceptor.processInvocation(ComponentDispatcherInterceptor.java:53) [jboss-as-ee-7.1.1.Final.jar:7.1.1.Final]
	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.1.Final.jar:1.1.1.Final]
	at org.jboss.as.ejb3.component.pool.PooledInstanceInterceptor.processInvocation(PooledInstanceInterceptor.java:51) [jboss-as-ejb3-7.1.1.Final.jar:7.1.1.Final]
	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.1.Final.jar:1.1.1.Final]
	at org.jboss.as.ejb3.tx.CMTTxInterceptor.invokeInOurTx(CMTTxInterceptor.java:228) [jboss-as-ejb3-7.1.1.Final.jar:7.1.1.Final]
	... 27 more

@Remote
public interface RemoteCSV
{
	public File createFile( String URI ) throws Exception;
}

@Stateless
public class CSVBean implements RemoteCSV
{
	@Override
	public File createFile( String URI ) throws Exception
	{
		return new CSV_Creator().createFile( URI );
	}
}

@Stateless
public class CSV_Creator extends DefaultActor implements Actor
{
	@PersistenceContext( unitName = "main_loader" )
	private EntityManager entityManager;
	
	private File saveFile( File file ) throws Exception
	{
		PrintWriter printWriter = new PrintWriter( "D:/error_logs.txt" );

		try
		{
			entityManager.persist( file );
		}
		catch( Exception ex )
		{
			ex.printStackTrace( printWriter );
		}
		finally
		{
			printWriter.close();
		}

		return file;
	}
}

package server.ejb;

@Local
public interface HelloUser
{
	void sayHello( String name );
}

@Stateless
public class HelloUserBean implements HelloUser
{
	@Override public void sayHello( String name )
	{
		System.out.println( "Hello " + name );
	}
}

import server.ejb.HelloUserBean;

public class Test
{
	@EJB
	public static HelloUserBean bean;

	public static void main( String... args )
	{
		bean.sayHello( "Alex" );
	}
}

package server.client;

import server.ejb.HelloUser;

public class HelloUserClient
{
	@EJB
	private HelloUser helloUser;

	public void sayHello( String name )
	{
		helloUser.sayHello( name );
	}
}

	HelloUserClient client = new HelloUserClient();
	client.sayHello( "Alex" );

package com.steeplesoft.enterpriseapp;

@Remote
public interface Dummy
{
	void sayHello( String name ) throws IOException;
}

@Stateless
public class DummyBean implements Dummy
{
	@Override
	public void sayHello( String name ) throws IOException
	{
		FileWriter fileWriter = new FileWriter( "D:/beans_test.txt" );
		fileWriter.write( name );
		fileWriter.close();
	}
}

package com.steeplesoft.acc.client;
import com.steeplesoft.enterpriseapp.Dummy;

public class Main
{
	@EJB
	private static Dummy dummy;

	public static void main( String... args ) throws FileNotFoundException
	{
		try
		{
			dummy.sayHello( "Alex" );

			FileWriter fileWriter = new FileWriter( "D:/test.txt" );
			fileWriter.write( "test" );
			fileWriter.close();
		}
		catch( IOException e )
		{
			PrintWriter printWriter = new PrintWriter( "D:/error_log.txt" );
			e.printStackTrace( printWriter );
			printWriter.close();
		}
	}
}