Java No Class Def error

Question

I am developing a Java application but I am getting a java.lang.NoClassDefFoundError. I have checked everything I can think of:

The jar file exists in the directory and is not 0 bytes
The jar file has the same permissions as all other jar files (I have shown this with ls -la cmmand)
The jar file contains the exact class that is reported as missing (I have shown this in output with the jar tf command)
jar file is specified in the command string under the -cp option I have changed the order of jars in class path and the other
jar files are recognised - otherwise the other parts of the program wouldn't work
It is the same jar file I am building against
Project works in eclipse on my laptop

It just doesn't work in my RaspberryPi.

I have to add something else to my checklist debugging of ClassNotFound errors. Does anyone have any suggestions?

I have the listing of the output of the checks I have run below.

pi@pi-raspbian-main ~/personal_services $ java -cp /home/pi/personal_services/Console/Console.jar:/home/pi/personal_services/lib/Library.jar:/home/pi/personal_services/lib/JavaCommon.jar:/home/pi/personal_services/lib/sqlite-jdbc-3.7.2.jar:/home/pi/personal_services/lib/commons-codec-1.10.jar metcarob.com.personalservices.console.Main /home/pi/personal_services/Console/ConsoleSettings.xml ListNodes
EVALUATING ListNodes
CONNECTING
Exception in thread "ConnectionThread" java.lang.NoClassDefFoundError: org/apache/commons/codec/binary/Base64
    at metcarob.com.common.network.xmlprotocol.ConnectionSocketContainer.ProcessIncommingMessages(Unknown Source)
    at metcarob.com.common.network.xmlprotocol.Connection.processIncomingMessages(Unknown Source)
    at metcarob.com.common.network.xmlprotocol.Connection.runDER(Unknown Source)
    at metcarob.com.common.thread.CloseableThread.run(Unknown Source)
RUNNING ListNodes
Closing connection
Closing connection
DONE
pi@pi-raspbian-main ~/personal_services $ jar tf /home/pi/personal_services/lib/commons-codec-1.10.jar | grep Base64
org/apache/commons/codec/binary/Base64.class
org/apache/commons/codec/binary/Base64InputStream.class
org/apache/commons/codec/binary/Base64OutputStream.class
pi@pi-raspbian-main ~/personal_services $ ls -la /home/pi/personal_services/lib/commons-codec-1.10.jar
-rw-r--r-- 1 pi pi 284184 Apr  3 20:54 /home/pi/personal_services/lib/commons-codec-1.10.jar

Thanks Robert

Did you check http://stackoverflow.com/questions/34413/why-am-i-getting-a-noclassdeffounderror-in-java — abRao, Apr 03 '15 at 23:16
The raspberry Pi has java version "1.8.0" Java(TM) SE Runtime Environment (build 1.8.0-b132) Java HotSpot(TM) Client VM (build 25.0-b70, mixed mode) in eclipse on my laptop I am building against jdk 1.7. Should this matter? It doesn't seem to with other jar files — Robert3452, Apr 03 '15 at 23:21
@Robert3452 Is that all stack traces that your program shows? because it's not `ClassNotFoundException` so there is possibility that the jvm did found the lib but failed to load it. — kucing_terbang, Apr 04 '15 at 08:19

score 0 · Answer 1 · answered Apr 07 '15 at 13:25

I have discovered the cause of my problem.

I have main app in: Console.jar Which used a utiliy jar: JavaCommon.jar which used: commons-codec-1.10.jar

When I built JavaCommon.jar I provided a class path which contained commons-codec-1.10.jar and it compiled without a problem

When I built Console.jar I provided a class path which contained JavaCommon.jar but did not contain commons-codec-1.10.jar and it compiled without a problem

Then when I ran my app I provided a classpath which contained all the jars but I still got the NoClassDefFoundError Exception

When I changed the build so I built Console.jar with a classpath containing all the jars again it compiled and ran without a problem.

Java No Class Def error

1 Answers1