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Author Message
Karn
 Post subject: NullPointerException at ConfigHelper in Hibernate 4
PostPosted: Wed Jan 04, 2012 7:46 pm 
Newbie

Joined: Wed Jan 04, 2012 7:27 pm
Posts: 1
Hi to all!
I am a newbie both at j2ee and hibernate. I try to create a simple servlet that should load some data from postgres into model. I use Eclipse Helios (for EE) and i downloaded hibernate 4 for ORM from db. I included all hibernate jars both into JRE configuration for my workspace and into WEB-INF/lib folder. I have no configuration for hibernate (do i need any?) but i included persistence.xml in my META-INF folder, and it contains this:
Code:
<?xml version="1.0" encoding="UTF-8"?>
<persistence version="1.0" 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_1_0.xsd">
<persistence-unit name="TaskPersistanceUnitName" transaction-type="RESOURCE_LOCAL">
   <provider>org.hibernate.ejb.HibernatePersistence</provider>
    <class>model.Task</class>
      <properties>
         <property name="hibernate.connection.driver_class" value="org.postgresql.Driver"/>
         <property name="hibernate.connection.username" value="postgres"/>
         <property name="hibernate.connection.password" value="1111"/>
         <property name="hibernate.connection.url" value="jdbc:postgresql://myhost/mydb"/>
         <property name="hibernate.max_fetch_depth" value="3"/>
         <property name="hibernate.dialect" value="org.hibernate.dialect.PostgreSQLDialect"/>
      </properties>
   </persistence-unit>
</persistence>


and i create web.xml for my servlet.
I use integrated (into Eclipse) tomcat server in my dev process, and when i query my servlet in logs i get smth like
Code:
SEVERE: Servlet.service() for servlet [OData] in context with path [/Hello] threw exception [Servlet execution threw an exception] with root cause
java.lang.NullPointerException
   at org.hibernate.internal.util.ConfigHelper.getResourceAsStream(ConfigHelper.java:170)
   at org.hibernate.cfg.Environment.<clinit>(Environment.java:221)
   at org.hibernate.cfg.Configuration.reset(Configuration.java:295)
   at org.hibernate.cfg.Configuration.<init>(Configuration.java:261)
   at org.hibernate.cfg.Configuration.<init>(Configuration.java:265)
   at org.hibernate.ejb.Ejb3Configuration.<clinit>(Ejb3Configuration.java:151)
   at org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:54)
   at javax.persistence.Persistence.createEntityManagerFactory(Unknown Source)
   at javax.persistence.Persistence.createEntityManagerFactory(Unknown Source)
   at ru.croc.wli.odata.TaskODataProducer.create(TaskODataProducer.java:16)
   at org.odata4j.producer.resources.ODataProducerProvider.newProducerFromFactory(ODataProducerProvider.java:63)
   at org.odata4j.producer.resources.ODataProducerProvider.getInstance(ODataProducerProvider.java:45)
   at org.odata4j.producer.resources.ODataProducerProvider.getInstance(ODataProducerProvider.java:15)
   at com.sun.jersey.core.impl.provider.xml.LazySingletonContextProvider.get(LazySingletonContextProvider.java:83)
   at com.sun.jersey.core.impl.provider.xml.LazySingletonContextProvider.access$000(LazySingletonContextProvider.java:55)
   at com.sun.jersey.core.impl.provider.xml.LazySingletonContextProvider$1.getValue(LazySingletonContextProvider.java:72)
   at com.sun.jersey.server.impl.inject.AbstractHttpContextInjectable$1.getValue(AbstractHttpContextInjectable.java:104)
   at com.sun.jersey.server.impl.inject.InjectableValuesProvider.getInjectableValues(InjectableValuesProvider.java:46)
   at com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$EntityParamInInvoker.getParams(AbstractResourceMethodDispatchProvider.java:153)
   at com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$ResponseOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:203)
   at com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:75)
   at com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:288)
   at com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:108)
   at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)
   at com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:84)
   at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1469)
   at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1400)
   at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1349)
   at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1339)
   at com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:416)
   at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:537)
   at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:699)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
   at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
   at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
   at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224)
   at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
   at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462)
   at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
   at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
   at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:851)
   at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
   at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:405)
   at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:278)
   at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:515)
   at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:300)
   at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
   at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
   at java.lang.Thread.run(Thread.java:662)


Does anyone can explain me what the problem is? I look at org.hibernate.internal.util.ConfigHelper.getResourceAsStream(ConfigHelper.java:170) and i see only
Code:
stream = Environment.class.getClassLoader().getResourceAsStream( stripped );

there. AFAIU the only reason could be a null, returned from Environment.class.getClassLoader() but i completely cannot understand why
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