A second cause could be that the PersistenceService has not been started
yet.
The persistence service is started by the PersistFiler.init() method.
Unfortunately there is no way of checking if the PersistanceService is
already started. And trying to start it twice will cause an exception
the be thrown.
So my advice:
Make sure to delay the accessing of the DB until after the
PersistFiler.init() method and wrap your code in a UnitOfWork.
The simplest trick is to register another ServletFilter after the
PersistFilter and place your code in the init() method of this filter...
You may also have a look at Onami Persist which is an alternative
implementation (but without @Finder)
On 01.12.2017 23:25, Diogo Luzzardi de Carvalho wrote:
On Friday, December 1, 2017 at 8:18:46 PM UTC-2, Diogo Luzzardi de
Carvalho wrote:
|
java.lang.NullPointerException
at
com.google.inject.persist.jpa.JpaPersistService.begin(JpaPersistService.java:77)
at
com.google.inject.persist.jpa.JpaLocalTxnInterceptor.invoke(JpaLocalTxnInterceptor.java:53)
at
com.app.guice.AppGuiceServletContextListener.contextInitialized(AppGuiceServletContextListener.java:60)
at
org.mortbay.jetty.handler.ContextHandler.startContext(ContextHandler.java:548)
at org.mortbay.jetty.servlet.Context.startContext(Context.java:136)
at
org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1234)
at
org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:517)
at
org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:460)
at
org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
at
org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130)
at org.mortbay.jetty.Server.doStart(Server.java:222)
at
org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
at com.app.Start.start(Start.java:126)
at com.app.Start.main(Start.java:194)
|
Follows my servlet context listener:
|
package com.app.guice;
import javax.servlet.ServletContext;
import javax.servlet.ServletContextEvent;
import org.mortbay.jetty.Server;
import com.app.setup.AppLifeCycle;
import com.google.inject.Guice;
import com.google.inject.Injector;
import com.google.inject.Provides;
import com.google.inject.Singleton;
import com.google.inject.servlet.GuiceServletContextListener;
public class AppGuiceServletContextListener extends
GuiceServletContextListener {
private AppLifeCycle appLifeCycle;
private Server server;
private ServletContext servletContext;
private Injector injector;
public AppGuiceServletContextListener(Server server) {
super();
this.server = server;
}
@Override
public void contextDestroyed(ServletContextEvent ctx) {
super.contextDestroyed(ctx);
if(appLifeCycle!= null) {
appLifeCycle.destroy();
}
}
@Override
public void contextInitialized(ServletContextEvent
servletContextEvent) {
servletContext = servletContextEvent.getServletContext();
super.contextInitialized(servletContextEvent);
appLifeCycle = injector.getInstance(AppLifeCycle.class);
appLifeCycle.init(servletContext);
}
@Provides
@Singleton
Server provideServer(Injector injector) {
final Server server = this.server;
injector.injectMembers(server);
returnserver;
}
@Override
protected Injector getInjector() {
System.out.println(servletContext);
if (injector == null)
injector = Guice.createInjector(new
MainModule(String.format("%s/WEB-INF/app",
servletContext.getRealPath("/")), servletContext));
returninjector;
}
}
|
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