问题
It works fine when compiling project, but after exporting it to a runnable jar and launching, it can't find external files and throws an error. What should I do?
回答1:
You could attempt building a fat jar that includes all the jars. It contains a custom class loader to load the jars referenced externally by your project.
Try using http://fjep.sourceforge.net/ plugin to build a fat jar.
You can export a java project containing jars using the File -> Export -> Other -> One Jar Exporter.
The jar thus exported works fine.
回答2:
Add external libraries to the manifest.mf:
Class-Path: . MyApp_lib/extlib.jar MyApp_lib/extlib2.jar ...
回答3:
You have to keep all required jars in the classpath to run your jar. Run your jar like :
java -cp extlib/* -jar yourjar.jar OR java -cp lib1.jar:lib2.jar:.. -jar yourjar.jar
回答4:
Make sure that while building the jar, you include all the used libraries(include everything from class path). This issue will happen when you refer a external jar.
回答5:
You can include a classpath variable in the jar's manifest file.
JAR file classpath
来源：https://stackoverflow.com/questions/12039948/how-to-attach-libraries-to-jar-file