Java 第一次连接到数据库时日志中的空指针

在我第一次使用

createEntityManager（）连接到数据库时，我在tomcat的控制台上得到了一个
NullPointerException
。我正在使用：


ApacheTomcat 8.0.24
eclipselink 2.6.1-RC1（JPA间接使用）
sqlite jdbc 3.8.10.1

日志消息如下所示：

[EL Warning]: connection: 2015-08-21 16:01:51.569--java.lang.NullPointerException
[EL Info]: 2015-08-21 16:01:51.585--ServerSession(29156874)--EclipseLink, version: Eclipse Persistence Services - 2.6.1.v20150605-31e8258
[EL Info]: connection: 2015-08-21 16:01:52.365--Not able to detect platform for vendor name [SQLite33.8.10.1]. Defaulting to [org.eclipse.persistence.platform.database.DatabasePlatform]. The database dialect used may not match with the database you are using. Please explicitly provide a platform using property "eclipselink.target-database".
[EL Info]: connection: 2015-08-21 16:01:52.505--ServerSession(29156874)--/file:/C:/eclipse_ee/workspaces/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/jeejpa/WEB-INF/classes/_training-jpa login successful

    String platformClass
            = ServerPlatformUtils.detectServerPlatform(null);
    try {
        detectedPlatform
                = ServerPlatformUtils.createServerPlatform(
                null, platformClass,
                SessionManager.class.getClassLoader());
    } catch (NullPointerException npe) {
        //some platforms may not be handling 'null' session well,
        //so be defensive here and only log throwable here
        detectedPlatform = null;
        LOG.logThrowable(SessionLog.WARNING,
                AbstractSessionLog.CONNECTION, npe);
    }

我的应用程序似乎工作正常-我是否需要关心有关NullPointerException的警告？还是我必须关心信息

Not able to detect platform for vendor name [SQLite33.8.10.1].
Defaulting to [org.eclipse.persistence.platform.database.DatabasePlatform].
The database dialect used may not match with the database you are using.
Please explicitly provide a platform using property "eclipselink.target-database".

编辑：
感谢@baumato的帮助和设置
有关无法检测的信息。。。不再出现了。详细的NullPointerException现在是：

[EL Finest]: jpa: 2015-08-21 16:44:52.954--ServerSession(12993102)--Thread(Thread[http-nio-8443-exec-6,5,main])--Begin deploying Persistence Unit training-jpa; session /file:/C:/eclipse_ee/workspaces/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/jeejpa/WEB-INF/classes/_training-jpa; state Predeployed; factoryCount 1
[EL Finest]: jpa: 2015-08-21 16:44:52.964--ServerSession(12993102)--Thread(Thread[http-nio-8443-exec-6,5,main])--Bean Validation Factory was not initialized: [javax/validation/Validation].
[EL Warning]: connection: 2015-08-21 16:44:52.974--Thread(Thread[http-nio-8443-exec-6,5,main])--java.lang.NullPointerException
    at org.eclipse.persistence.platform.server.ServerPlatformUtils.createServerPlatform(ServerPlatformUtils.java:99)
    at org.eclipse.persistence.sessions.factories.SessionManager.init(SessionManager.java:77)
    at org.eclipse.persistence.sessions.factories.SessionManager.<clinit>(SessionManager.java:71)
    at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.addSessionToGlobalSessionManager(EntityManagerSetupImpl.java:907)
    at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.initSession(EntityManagerSetupImpl.java:2671)
    at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:675)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.getAbstractSession(EntityManagerFactoryDelegate.java:205)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.createEntityManagerImpl(EntityManagerFactoryDelegate.java:305)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManagerImpl(EntityManagerFactoryImpl.java:337)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:303)
    at de.training.beans.LoginBean.login(LoginBean.java:58)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:483)
    at org.apache.el.parser.AstValue.invoke(AstValue.java:247)
    at org.apache.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:267)
    at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:105)
    at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:87)
    at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102)
    at javax.faces.component.UICommand.broadcast(UICommand.java:315)
    at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:790)
    at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1282)
    at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:81)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
    at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:198)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:654)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at de.training.filter.URILoggerFilter.doFilter(URILoggerFilter.java:24)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at de.training.filter.LoginFilter.doFilter(LoginFilter.java:38)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:614)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
    at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:617)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:518)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1091)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:668)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1527)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1484)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Thread.java:745)

[EL Finer]: 2015-08-21 16:44:52.974--Thread(Thread[http-nio-8443-exec-6,5,main])--initializing session manager

jpa:2015-08-21 16:44:52.954——服务器会话（12993102）——线程（线程[http-nio-8443-exec-6,5，main]）——开始部署持久性单元训练jpa；会话/文件：/C:/eclipse\u ee/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/jeejpa/WEB-INF/classes//u training-jpa；国家预先部署；工厂计数1
[EL Finest]：jpa:2015-08-21 16:44:52.964--服务器会话（12993102）--线程（线程[http-nio-8443-exec-6,5，main]）--未初始化Bean验证工厂：[javax/Validation/Validation]。
[EL Warning]：连接：2015-08-21 16:44:52.974——线程（线程[http-nio-8443-exec-6,5，main]）——java.lang.NullPointerException
位于org.eclipse.persistence.platform.server.ServerPlatformUtils.createServerPlatform（ServerPlatformUtils.java:99）
位于org.eclipse.persistence.sessions.factories.SessionManager.init（SessionManager.java:77）
位于org.eclipse.persistence.sessions.factories.SessionManager（SessionManager.java:71）
位于org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.addSessionToGlobalSessionManager（EntityManagerSetupImpl.java:907）
位于org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.initSession（EntityManagerSetupImpl.java:2671）
位于org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy（EntityManagerSetupImpl.java:675）
位于org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.getAbstractSession（EntityManagerFactoryDelegate.java:205）
位于org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.createEntityManagerImpl（EntityManagerFactoryDelegate.java:305）
位于org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManagerImpl（EntityManagerFactoryImpl.java:337）
位于org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManager（EntityManagerFactoryImpl.java:303）
登录（LoginBean.java:58）
在sun.reflect.NativeMethodAccessorImpl.invoke0（本机方法）处
位于sun.reflect.NativeMethodAccessorImpl.invoke（NativeMethodAccessorImpl.java:62）
在sun.reflect.DelegatingMethodAccessorImpl.invoke（DelegatingMethodAccessorImpl.java:43）中
位于java.lang.reflect.Method.invoke（Method.java:483）
位于org.apache.el.parser.AstValue.invoke（AstValue.java:247）
位于org.apache.el.MethodExpressionImpl.invoke（MethodExpressionImpl.java:267）
在com.sun.faces.facelets.el.TagMethodExpression.invoke（TagMethodExpression.java:105）上
位于javax.faces.component.MethodBindingMethodExpressionAdapter.invoke（MethodBindingMethodExpressionAdapter.java:87）
位于com.sun.faces.application.ActionListenerImpl.processAction（ActionListenerImpl.java:102）
在javax.faces.component.UICommand.broadcast（UICommand.java:315）
位于javax.faces.component.UIViewRoot.broadcastEvents（UIViewRoot.java:790）
位于javax.faces.component.UIViewRoot.processApplication（UIViewRoot.java:1282）
位于com.sun.faces.lifecycle.InvokeApplicationPhase.execute（InvokeApplicationPhase.java:81）
位于com.sun.faces.lifecycle.Phase.doPhase（Phase.java:101）
在com.sun.faces.lifecycle.LifecycleImpl.execute上（LifecycleImpl.java:198）
位于javax.faces.webapp.FacesServlet.service（FacesServlet.java:654）
位于org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:291）
位于org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:206）
位于org.apache.tomcat.websocket.server.WsFilter.doFilter（WsFilter.java:52）
位于org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:239）
位于org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:206）
位于de.training.filter.URILoggerFilter.doFilter（URILoggerFilter.java:24）
位于org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:239）
位于org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:206）
位于de.training.filter.LoginFilter.doFilter（LoginFilter.java:38）
位于org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:239）
位于org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:206）
位于org.apache.catalina.core.StandardWrapperValve.invoke（StandardWrapperValve.java:219）
位于org.apache.catalina.core.StandardContextValve.invoke（StandardContextValve.java:106）
位于org.apache.catalina.authenticator.AuthenticatorBase.invoke（AuthenticatorBase.java:614）
位于org.apache.catalina.core.StandardHostValve.invoke（StandardHostValve.java:142）
位于org.apache.catalina.valves.ErrorReportValve.invoke（ErrorReportValve.java:79）
位于org.apache.catalina.valves.AbstractAccessLogValve.invoke（AbstractAccessLogValve.java:617）
位于org.apache.catalina.core.StandardEngineValve.invoke（StandardEngineValve.java:88）
位于org.apache.catalina.connector.CoyoteAdapter.service（CoyoteAdapter.java:518）
位于org.apache.coyote.http11.AbstractHttp11Processor.process（AbstractHttp11Processor.java:1091）
位于org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process（AbstractProtocol.java:668）
位于org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun（NioEndpoint.java:1527）
位于org.apache.tomcat.util.ne
<property name="eclipselink.target-database" value="Auto" />

<property name="eclipselink.target-database" value="Database" />

    String platformClass
            = ServerPlatformUtils.detectServerPlatform(null);
    try {
        detectedPlatform
                = ServerPlatformUtils.createServerPlatform(
                null, platformClass,
                SessionManager.class.getClassLoader());
    } catch (NullPointerException npe) {
        //some platforms may not be handling 'null' session well,
        //so be defensive here and only log throwable here
        detectedPlatform = null;
        LOG.logThrowable(SessionLog.WARNING,
                AbstractSessionLog.CONNECTION, npe);
    }