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java.lang.NullPointerException at com.sun.tools.javac.comp.Check.checkCompatibleConcretes(Check.java:1212) at com.sun.tools.javac.comp.Check.checkCompatibleSupertypes(Check.java:1564) at com.sun.tools.javac.comp.Attr.attribClassBody(Attr.java:2518) at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:2472) at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:2408) at com.sun.tools.javac.main.JavaCompiler.attribute(JavaCompiler.java:891) at com.sun.tools.javac.main.JavaCompiler.attribute(JavaCompiler.java:867) at com.sun.tools.javac.main.JavaCompiler.compile2(JavaCompiler.java:660) at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:633) at com.sun.tools.javac.main.Main.compile(Main.java:761) at com.sun.tools.javac.main.Main.compile(Main.java:686) at com.sun.tools.javac.main.Main.compile(Main.java:675) at com.sun.tools.javac.Main.compile(Main.java:70) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:589) at org.apache.tools.ant.taskdefs.compilers.Javac13.execute(Javac13.java:55) at org.apache.tools.ant.taskdefs.Javac.compile(Javac.java:931) at org.apache.tools.ant.taskdefs.Javac.execute(Javac.java:757) at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275) at org.apache.tools.ant.Task.perform(Task.java:364) at org.apache.tools.ant.taskdefs.Sequential.execute(Sequential.java:64) at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275) at org.apache.tools.ant.Task.perform(Task.java:364) at org.apache.tools.ant.taskdefs.MacroInstance.execute(MacroInstance.java:378) at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275) at org.apache.tools.ant.Task.perform(Task.java:364) at org.apache.tools.ant.Target.execute(Target.java:341) at org.apache.tools.ant.Target.performTasks(Target.java:369) at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1216) at org.apache.tools.ant.Project.executeTarget(Project.java:1185) at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:40) at org.apache.tools.ant.Project.executeTargets(Project.java:1068) at org.apache.tools.ant.module.bridge.impl.BridgeImpl.run(BridgeImpl.java:234) at org.apache.tools.ant.module.run.TargetExecutor.run(TargetExecutor.java:287) at org.netbeans.core.execution.RunClassThread.run(RunClassThread.java:125)