On Monday, March 25, 2013 1:25:29 AM UTC+1, Kris wrote: > > GWT 2.5.1 > Maven 3.0.4 > > Hi, suddenly I get this error, and I google it for a while now, and can > see others had the problem. > But no solution... > > * java.lang.NullPointerException* > *[ERROR] at > com.google.gwt.dev.util.DiskCache.transferToStream(DiskCache.java:187)* > *[ERROR] at > com.google.gwt.dev.util.DiskCacheToken.writeObject(DiskCacheToken.java:91) > * > *[ERROR] at sun.reflect.GeneratedMethodAccessor24.invoke(Unknown Source)* > *[ERROR] at > sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) > * >
The only reason this can happen is if the JVM is shutting down while threads are trying to write to the DiskCache, which would be abnormal. And indeed it is: your problem is not this NPE, it's an internal compiler error: [INFO] [ERROR] Unexpected internal compiler error [INFO] java.lang.NoSuchFieldError: warningThreshold [INFO] at com.google.gwt.dev.javac.JdtCompiler.getCompilerOptions(JdtCompiler.java:413) And this NoSuchFieldError can only happen if you have JDT/ECJ in your classpath (from a version incompatible with the one bundled within GWT). You're best option is to use separate client and server code in distinct artifacts (see https://github.com/tbroyer/gwt-maven-archetypes for examples, https://groups.google.com/d/topic/codehaus-mojo-gwt-maven-plugin-users/vrLAcqp5oAg/discussion for the rationale; see also https://plus.google.com/113945685385052458154/posts/RDrK7ukVFqJ if you're OK to try alpha software) but a short-term solution is to use gwtSdkFirstInClasspath: http://mojo.codehaus.org/gwt-maven-plugin/compile-mojo.html#gwtSdkFirstInClasspath -- You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group. To unsubscribe from this group and stop receiving emails from it, send an email to google-web-toolkit+unsubscr...@googlegroups.com. To post to this group, send email to google-web-toolkit@googlegroups.com. Visit this group at http://groups.google.com/group/google-web-toolkit?hl=en. For more options, visit https://groups.google.com/groups/opt_out.
