另一个Java类路径问题

Question

I used Maven shade plugin to build the executable jar, which works fine when it include the properties in the build.

But when I tried to move properties out to a separate folder, it failed with java.io.FileNotFoundException: class path resource [app.properties] cannot be opened because it does not exist .

I have tried the following three methods, but all failed:

1. java -cp "properties" (or ".\\*;properties\\*" ) -jar app.jar
2. SET CLASSPATH =.\\*;properties\\*
3. or even put app.properties in the same path as app.jar

As you can see the path separator, I used Windows to run the jar.

[update]

I changed the shade config (from only <mainClass> to <manifestEntries> ) as below, and it resolved the issue.

<transformer
        implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
    <manifestEntries>
        <Main-Class>com.lifeshield.reminder.App</Main-Class>
        <Class-Path>properties/</Class-Path>
        <Build-Number>0.1</Build-Number>
    </manifestEntries>
</transformer>

@Marko Živanović, thanks for pointing out the -cp and -jar usage.

Answer 1

You cannot use both -cp and -jar options.

If you use -jar then you have set classpath in manifest file. More details .

If you want to use -cp then you have to run application by specifying class name. Details .