VFY: unable to find class referenced in signature

Question

I have a simple android application which uses a modbus library ("jamod") on its build path. It crashes immediately as i run it. I have basically the same problem in this question: Getting "Caused by: java.lang.VerifyError:"

But i cannot really fix the problem. My application was working fine before, now no matter what i do it doesn't seem to work.

Below is logcat output. Thanks in advance.

08-09 14:36:47.753: W/dalvikvm(396): VFY: unable to find class referenced in signature (Lnet/wimpi/modbus/net/TCPMasterConnection;)
08-09 14:36:47.823: W/dalvikvm(396): VFY: unable to resolve exception class 510 (Lnet/wimpi/modbus/ModbusIOException;)
08-09 14:36:47.823: W/dalvikvm(396): VFY: unable to find exception handler at addr 0x18
08-09 14:36:47.854: W/dalvikvm(396): VFY:  rejected Lcom/example/xmlparsertest/JavaModBusTcpDriver;.<init> (Ljava/lang/String;I)V
08-09 14:36:47.854: W/dalvikvm(396): VFY:  rejecting opcode 0x0d at 0x0018
08-09 14:36:47.854: W/dalvikvm(396): VFY:  rejected Lcom/example/xmlparsertest/JavaModBusTcpDriver;.<init> (Ljava/lang/String;I)V
08-09 14:36:47.854: W/dalvikvm(396): Verifier rejected class Lcom/example/xmlparsertest/JavaModBusTcpDriver;
08-09 14:36:47.854: D/AndroidRuntime(396): Shutting down VM
08-09 14:36:47.854: W/dalvikvm(396): threadid=1: thread exiting with uncaught exception (group=0x4001d800)
08-09 14:36:47.873: E/AndroidRuntime(396): FATAL EXCEPTION: main
08-09 14:36:47.873: E/AndroidRuntime(396): java.lang.VerifyError: com.example.xmlparsertest.JavaModBusTcpDriver
08-09 14:36:47.873: E/AndroidRuntime(396):  at com.example.xmlparsertest.MainActivity.<init>(MainActivity.java:13)
08-09 14:36:47.873: E/AndroidRuntime(396):  at java.lang.Class.newInstanceImpl(Native Method)
08-09 14:36:47.873: E/AndroidRuntime(396):  at java.lang.Class.newInstance(Class.java:1429)
08-09 14:36:47.873: E/AndroidRuntime(396):  at android.app.Instrumentation.newActivity(Instrumentation.java:1021)
08-09 14:36:47.873: E/AndroidRuntime(396):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2577)
08-09 14:36:47.873: E/AndroidRuntime(396):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
08-09 14:36:47.873: E/AndroidRuntime(396):  at android.app.ActivityThread.access$2300(ActivityThread.java:125)
08-09 14:36:47.873: E/AndroidRuntime(396):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
08-09 14:36:47.873: E/AndroidRuntime(396):  at android.os.Handler.dispatchMessage(Handler.java:99)
08-09 14:36:47.873: E/AndroidRuntime(396):  at android.os.Looper.loop(Looper.java:123)
08-09 14:36:47.873: E/AndroidRuntime(396):  at android.app.ActivityThread.main(ActivityThread.java:4627)
08-09 14:36:47.873: E/AndroidRuntime(396):  at java.lang.reflect.Method.invokeNative(Native Method)
08-09 14:36:47.873: E/AndroidRuntime(396):  at java.lang.reflect.Method.invoke(Method.java:521)
08-09 14:36:47.873: E/AndroidRuntime(396):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
08-09 14:36:47.873: E/AndroidRuntime(396):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
08-09 14:36:47.873: E/AndroidRuntime(396):  at dalvik.system.NativeStart.main(Native Method)

Answer 1

One thing to double check you are doing is that the checkbox is ticked for the jar files in the "Order and Export" tab in the Build path window. That will include the library in the built APK.

Answer 2

Did you put the jamod jar file in the "libs" directory in Eclipse? If not it won't be bundled into your application even if it is on the path during compilation. This is a fairly new change.