This is what I mentioned before.
You cannot use any of the JPA stuff until PersistService.start() has
been called.
This will be called by the PersistFilter.init().
So you have to wait with the appLifeCycle.init() until after the init()
method of PersistFilter
On 04.12.2017 16:58, Diogo Luzzardi de Carvalho wrote:
Unfortunately it is not. I notice that when I change my code to do the
following:
|
injector = Guice.createInjector(new
MainModule(String.format("%s/WEB-INF/app",
getServletContext().getRealPath("/")), getServletContext()));
UnitOfWork unitOfWork = injector.getInstance(UnitOfWork.class);
System.out.println(unitOfWork);
unitOfWork.begin();
try {
appLifeCycle = injector.getInstance(AppLifeCycle.class);
appLifeCycle.init(getServletContext());
} finally {
unitOfWork.end();
}
return injector;
|
The injector was able to inject the UnitOfWork but when I call the
method unitOfWork.begin() the exception occurs at line 77 of the
JpaPersistService.
On Monday, December 4, 2017 at 1:24:10 PM UTC-2, scl wrote:
Is this an open source project?
If sou you could point me to the repo and I can have a look.
On 04.12.2017 16:22, Diogo Luzzardi de Carvalho wrote:
Hi,
I tried both of your solutions, and the nullpointer keeps happen.
Also I debug the application and I installed the JpaPersistModule
before I try to run the code when the exception happens.
regards
Diogo
On Friday, December 1, 2017 at 8:42:53 PM UTC-2, scl wrote:
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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