How does the Java – runnable jar load external XML files at runtime?

(this seems to be a trivial problem, but it lasted for 2 days: ()

I have a runnable jar (created using the Maven assembly plug-in) The class in jar looks for the XML file in the classpath However, we don't want to bundle jar files into jars and externalize them

Tried until now:

>Set classpath at run time:

java -classpath ./conf -jar my-jar-with-dependencies.jar

==>Do not load (CONF folder contains XML)

>Set classpath in assembler plug-in

<plugin>
        <artifactId>maven-assembly-plugin</artifactId>
        <executions>
            <execution>
                <id>make-assembly</id>
                <phase>package</phase>
                <goals>
                    <goal>single</goal>
                </goals>
            </execution>
        </executions>
        <configuration>
            <archive>
                <manifest>
                    <mainClass>com.xxx.Test</mainClass>
                    <addClasspath>true</addClasspath>
                    <classpathPrefix>./conf/</classpathPrefix>
                </manifest>
            </archive>
            <descriptorRefs>
                <descriptorRef>jar-with-dependencies</descriptorRef>
            </descriptorRefs>
        </configuration>
    </plugin>

==>Classpath will not be added to manifest.path in runnable jar MF

Edit:

Generate mainfest.jar in jar MF：

Manifest-Version: 1.0
Archiver-Version: Plexus Archiver
Created-By: Apache Maven
Built-By: xxx
Build-Jdk: 1.7.0_21
Main-Class: com.xxx.Test

Edit 2:

So I edited the generated manifest in jar and recreated the jar Still no XML found!

Manifest-Version: 1.0
Archiver-Version: Plexus Archiver
Created-By: Apache Maven
Built-By: xxx
Build-Jdk: 1.7.0_21
Main-Class: com.xxx.Test
Class-Path: . /* Tried with both . and ./conf */

Solution

When using the - jar parameter classpath, the specified content will be ignored It is designated here

The JVM uses the classpath specified in the manifest Make sure the manifest contains the classpath definition