无法在persistence.xml文件中调用JNDI资源 [英] Cannot call JNDI resource in persistence.xml file
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问题描述
尽管似乎许多用户都遇到了同样的问题，但我不得不发布我自己的问题，考虑到目前，已经存在的建议对我没有任何建议。还是我丢失了什么？
Although it seems many users faced the same problem, I have to post my own issue, taking in account that for now, no suggestion from those already present worked for me. Or maybe am I missing something?
这是我的 persistence.xml 文件（位于
Here is my persistence.xml file (located uner resources/META-INF/ directory, in a maven project):
<?xml version="1.0" encoding="UTF-8"?>
<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-unit name="brass-unit" transaction-type="RESOURCE_LOCAL">
<provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
<properties>
<property name="hibernate.connection.datasource" value="java:/comp/env/jdbc/BrassDB"/>
</properties>
</persistence-unit>
低于code >资源/ META-INF 我也有 context.xml 文件：
under resources/META-INF I also have context.xml file:
<?xml version="1.0" encoding="UTF-8"?>
<Context>
<Resource name="jdbc/BrassDB" auth="Container" type="javax.sql.DataSource"
driverClassName="org.postgresql.Driver"
url="jdbc:postgresql://localhost:5432/mydb" username="usr" password="pwd"
maxActive="20" maxIdle="10" maxWait="-1"/>
</Context>
在 web.xml 文件中：
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
<display-name>brass_directory_business</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
<resource-ref>
<description>db connection</description>
<res-ref-name>jdbc/BrassDB</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
</resource-ref>
关于web.xml的说明：有时我会评论 resource-ref 标记，但是行为结果相同。
Note on web.xml: sometimes I commented resource-ref tag, but the same behavior results.
现在，当我在servlet中运行此命令，一切正常：
Now, in my servlet, when I run this, everything works fine:
InitialContext ctx = null;
try {
ctx = new InitialContext();
if (ctx == null) {
throw new Exception("no context!");
}
DataSource ds = (DataSource)ctx.lookup("java:/comp/env/jdbc/BrassDB");
if (ds == null) {
throw new Exception("data source not found!");
}
Connection conn = ds.getConnection();
ResultSet rs = conn.createStatement().executeQuery("SELECT * FROM person");
int n = 0;
while (rs.next()) {
n++;
}
System.out.println("rs length is: " + n);
} catch (Exception e) {
e.printStackTrace();
}
但是当我运行此命令时：
But when I run this:
EntityManagerFactory emf = Persistence.createEntityManagerFactory("brass-unit");
EntityManager em = emf.createEntityManager();
em.createNamedQuery("Person.findAll", Person.class).getResultList();
我收到此异常：
Mar 04, 2014 4:48:56 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [com.banco.Test] in context with path [/brass_directory_business] threw exception
javax.persistence.PersistenceException: Unable to build entity manager factory
at org.hibernate.jpa.HibernatePersistenceProvider.createEntityManagerFactory(HibernatePersistenceProvider.java:81)
at org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:54)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:55)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:39)
at com.banco.Test.doPost(Test.java:34)
at com.banco.Test.doGet(Test.java:27)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:620)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1040)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:313)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:744)
Caused by: org.hibernate.engine.jndi.JndiException: Unable to lookup JNDI name [java:/comp/env/jdbc/BrassDB]
at org.hibernate.engine.jndi.internal.JndiServiceImpl.locate(JndiServiceImpl.java:117)
at org.hibernate.engine.jdbc.connections.internal.DatasourceConnectionProviderImpl.configure(DatasourceConnectionProviderImpl.java:115)
at org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.configureService(StandardServiceRegistryImpl.java:89)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:206)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:178)
at org.hibernate.engine.jdbc.internal.JdbcServicesImpl.buildJdbcConnectionAccess(JdbcServicesImpl.java:260)
at org.hibernate.engine.jdbc.internal.JdbcServicesImpl.configure(JdbcServicesImpl.java:94)
at org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.configureService(StandardServiceRegistryImpl.java:89)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:206)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:178)
at org.hibernate.cfg.Configuration.buildTypeRegistrations(Configuration.java:1885)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1843)
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl$4.perform(EntityManagerFactoryBuilderImpl.java:850)
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl$4.perform(EntityManagerFactoryBuilderImpl.java:843)
at org.hibernate.boot.registry.classloading.internal.ClassLoaderServiceImpl.withTccl(ClassLoaderServiceImpl.java:399)
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:842)
at org.hibernate.jpa.HibernatePersistenceProvider.createEntityManagerFactory(HibernatePersistenceProvider.java:73)
... 26 more
Caused by: javax.naming.NameNotFoundException: Name [java:/comp/env/jdbc/BrassDB] is not bound in this Context. Unable to find [java:].
at org.apache.naming.NamingContext.lookup(NamingContext.java:819)
at org.apache.naming.NamingContext.lookup(NamingContext.java:153)
at javax.naming.InitialContext.lookup(InitialContext.java:415)
at org.hibernate.engine.jndi.internal.JndiServiceImpl.locate(JndiServiceImpl.java:114)
... 42 more
我的 pom.xml 看起来像：
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
//......
<dependencies>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>4.3.1.Final</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-entitymanager</artifactId>
<version>4.3.1.Final</version>
</dependency>
//...
</dependencies>
<build>
<plugins>
<plugin>
//...
</plugin>
</plugins>
</build>
</project>
我正在使用tomcat 7.0.52作为服务器。
有人对如何解决我的问题有任何建议吗？
I'm using tomcat 7.0.52 as server. Does anyone have any suggestion how to solve my issue?
推荐答案
在我看来，这个问题是休眠问题。我只是将休眠版本更改为4.2.7，所以效果很好。
To me, it seems that this issue is a Hibernate problem. I just changed hibernate version to 4.2.7, and it works well.
这篇关于无法在persistence.xml文件中调用JNDI资源的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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