MavenReportException：JAVA_HOME 设置不正确

Question

I've tried many JDK versions in order to solve this problem but it seems no matter which java i'm using the outcome is always the same.

MavenReportException: Error while creating archive: Unable to find javadoc command: The environment variable JAVA_HOME is not correctly set.

Debug

These are the jdk's currently installed:

I ran:

export JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64

export PATH=$JAVA_HOME/bin:$PATH

java -version :

openjdk version "1.8.0_265"
OpenJDK Runtime Environment (build 1.8.0_265-8u265-b01-0ubuntu2~20.04-b01)
OpenJDK 64-Bit Server VM (build 25.265-b01, mixed mode)

javac -version

javac 1.8.0_265

mvn clean deploy -P release

MavenReportException: Error while creating archive: Unable to find javadoc command: The environment variable JAVA_HOME is not correctly set.

Maven Plugin Configuration

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-compiler-plugin</artifactId>
    <configuration>
        <source>1.8</source>
        <target>1.8</target>
        <executable>${JAVA_HOME}/bin/javac</executable>
    </configuration>
</plugin>

Although which java and which javadoc pointing to /usr/bin could that be the issue?

Edit 1

Contents of /bin

Answer 1

I don't know if this helps, but in my case maven Failed to execute goal org.apache.maven.plugins:maven-javadoc-plugin:3.2.0:jar and gave an exception: MavenReportException: Error while generating Javadoc: Unable to find javadoc command: The environment variable JAVA_HOME is not correctly set.

The solution was to find the plugin that was causing the issue, <artifactId>maven-javadoc-plugin</artifactId> in my case and add the following:

                <configuration>
                    <javadocExecutable>${java.home}/bin/javadoc</javadocExecutable>
                </configuration>

where ${java.home} was /usr/lib/jvm/java-11-openjdk-amd64/ .

The plugin looked like:

            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-javadoc-plugin</artifactId>
                <configuration>
                    <javadocExecutable>${java.home}/bin/javadoc</javadocExecutable>
                </configuration>
                <version>3.2.0</version>
                <executions>
                    <execution>
                        <id>attach-javadocs</id>
                        <goals>
                            <goal>jar</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>

and the goal was executed successfully.

Answer 2

Please check the java version for Maven using the following command:

#mvn --version

It will give something like:

Apache Maven 3.5.3 (3383c37e1f9e9b3bc3df5050c29c8aff9f295297; 2018-02-25T01:19:05+05:30) Maven home: /home/user/apache-maven-3.5.3 Java version: 1.8.0_121, vendor: Oracle Corporation Java home: /home/user/jdk1.8.0_121/jre Default locale: en_IN, platform encoding: UTF-8

Here, you can see which JAVA version is used and its location.