log4j class not found in generated jar

Question

I generate jar file with maven-assembly-plugin plugin. I use java -jar to execute jar. I got error message:

log4j: WARN JmDNS or serviceInfo not found

I tried to use path to jar in -classpath, but got same error.

Plugin configuration:

    <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-assembly-plugin</artifactId>
        <version>3.1.0</version>
        <executions>
            <execution>
                <id>make-assembly</id>
                <phase>package</phase>
                <goals>
                    <goal>single</goal>
                </goals>
            </execution>
        </executions>
        <configuration>
            <archive>
                <manifest>
                    <mainClass>test.LeanFTest</mainClass>
                </manifest>
            </archive>
            <finalName>${project.artifactId}-fatjar-${project.version}</finalName>
            <appendAssemblyId>false</appendAssemblyId>
            <descriptors>
                <descriptor>src/main/assembly/leanft-assembly.xml</descriptor>
            </descriptors>
        </configuration>
    </plugin>

@GhostCat : I missed plugin configuration, I edited question. — plaidshirt, Jul 02 '18 at 07:22
@GhostCat : I am still facing issues with this jar file, but not that was the root cause. — plaidshirt, Jul 10 '18 at 07:58

score 1 · Accepted Answer · answered Jul 02 '18 at 07:40

1

Most likely, this boils down to:

Your maven build does not include dependent artefacts into your JAR file. In other words: the JAR you create does not include the logj4 JARs. You can change that with your maven config, see here for details.
As your JAR doesn't contain the dependencies, all JARs you depend on must be in your classpath. Meaning: when you run your new JAR on the command line, all elements that might be required for running it must be present on the classpath.

answered Jul 02 '18 at 07:40

GhostCat

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Dependencies are included in this jar file, but I already tried to use path to log4j jar file in classpath. – plaidshirt Jul 02 '18 at 07:44
How can they be included when the maven config your are showing isn't written to include them? – GhostCat Jul 02 '18 at 07:53
I use two plugins to generate jar. Another one is `maven-jar-plugin`. I have two jars generated, 60 KB and 16 MB, but all the jars are copied to a `lib` named folder. – plaidshirt Jul 02 '18 at 08:02

log4j class not found in generated jar

1 Answers1