[英]How to fix: Exception in thread “main” java.lang.NoClassDefFoundError in BoneCP
I'm working from this example and I am running into this error after adding log4j, slf4j and bonecp to the project: 我正在使用这个示例,在将log4j,slf4j和bonecp添加到项目后,我遇到了这个错误:
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)
In addition to BoneCP and SLF4J, you need to add Google Guava , because BoneCP's requirements page states that it needs to be present. 除了BoneCP和SLF4J之外,您还需要添加Google Guava ,因为BoneCP的需求页面指出它需要存在。 Download
guava-*.jar
and add it to your classpath the same way you did with SLF4J and BoneCP. 下载
guava-*.jar
并将其添加到类路径中,就像使用SLF4J和BoneCP一样。
You will need to add those jars to the classpath of your Java process when you run it. 运行它时,您需要将这些jar添加到Java进程的类路径中。 For example,
例如,
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. 这假设jar位于名为lib的目录中,该目录位于执行Java命令的目录中。
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