How to fix: Exception in thread "main" java.lang.NoClassDefFoundError in BoneCP

Question

I'm working from this example and I am running into this error after adding log4j, slf4j and bonecp to the project:

run:
Exception in thread "main" java.lang.NoClassDefFoundError: com/google/common/base/FinalizableReferenceQueue
    at com.jolbox.bonecp.BoneCP.<init>(BoneCP.java:321)
    at javasampleapps.BoneCPExample.main(BoneCPExample.java:35)
Caused by: java.lang.ClassNotFoundException: com.google.common.base.FinalizableReferenceQueue
    at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
    at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
    ... 2 more
Java Result: 1
BUILD SUCCESSFUL (total time: 3 seconds)

score 3 · Accepted Answer · answered Dec 05 '11 at 16:53

3

In addition to BoneCP and SLF4J, you need to add Google Guava, because BoneCP's requirements page states that it needs to be present. Download guava-*.jar and add it to your classpath the same way you did with SLF4J and BoneCP.

answered Dec 05 '11 at 16:53

Eli Acherkan

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score 1 · Answer 2 · answered Dec 05 '11 at 16:20

1

You will need to add those jars to the classpath of your Java process when you run it. For example,

java -classpath lib/log4j.jar;lib/slf4j.jar;lib/bonecp.jar [your_class]

This assumes that the jars are in a dir called lib which is in the directory you execute the Java command from.

answered Dec 05 '11 at 16:20

ewan.chalmers

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I added them to the libraries section of my project? Doesn't it add it to the classpath upon doing that? – davidahines Dec 05 '11 at 16:22
1

Your IDE may add them to your build classpath automatically. Depending on how you execute Java, you may have to add them to your runtime classpath yourself. – ewan.chalmers Dec 05 '11 at 16:26
It turned out to be guava that I hadn't added. Thanks. – davidahines Dec 05 '11 at 16:42

How to fix: Exception in thread "main" java.lang.NoClassDefFoundError in BoneCP

2 Answers2