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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)