Maven 3.8.0 Compiler - Fatal error compiling: release version 11 not supported

Question

I'm unable to build using Java 11 with the latest version of the maven-compiler-plugin.

pom.xml:

<build>     <plugins>         <plugin>             <groupId>org.apache.maven.plugins</groupId>             <artifactId>maven-compiler-plugin</artifactId>             <version>3.8.0</version>             <configuration>                 <release>11</release>             </configuration>         </plugin>     <plugins> <build> 

when I try to build using Maven:

➜  mvn clean compile [INFO] Scanning for projects... [INFO]  [INFO] ------------------------------------------------------------------------ [INFO] Building service 0.0.1-SNAPSHOT [INFO] ------------------------------------------------------------------------ [INFO]  [INFO] --- maven-compiler-plugin:3.8.0:compile (default-compile) @ service --- [INFO] Changes detected - recompiling the module! [INFO] Compiling 80 source files to /home/mip/service/target/classes [INFO] ------------------------------------------------------------------------ [INFO] BUILD FAILURE [INFO] ------------------------------------------------------------------------ [INFO] Total time: 2.859 s [INFO] Finished at: 2018-08-01T11:20:55+01:00 [INFO] Final Memory: 32M/124M [INFO] ------------------------------------------------------------------------ [ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.8.0:compile (default-compile) on project service: Fatal error compiling: release version 11 not supported -> [Help 1] [ERROR]  [ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch. [ERROR] Re-run Maven using the -X switch to enable full debug logging. [ERROR]  [ERROR] For more information about the errors and possible solutions, please read the following articles: [ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException 

Here are the Maven and Java versions which I am using:

➜  mvn -version Apache Maven 3.5.2 Maven home: /usr/share/maven Java version: 10.0.1, vendor: Oracle Corporation Java home: /usr/lib/jvm/java-11-openjdk-amd64 Default locale: en_GB, platform encoding: UTF-8 OS name: "linux", version: "4.15.0-29-generic", arch: "amd64", family:     "unix" ➜  /usr/lib/jvm/java-11-openjdk-amd64/bin/java -version openjdk version "10.0.1" 2018-04-17 OpenJDK Runtime Environment (build 10.0.1+10-Ubuntu-3ubuntu1) OpenJDK 64-Bit Server VM (build 10.0.1+10-Ubuntu-3ubuntu1, mixed mode) 

Could Java 11 identifying itself as "10.0.1" be causing the problem? If I modify my pom.xml to <release>10</release> then it builds with no issue, even though I do not have Java 10 installed.

➜  ~ /usr/lib/jvm/java-11-openjdk-amd64/bin/javac -version javac 10.0.1   ➜ javac --release 11 SomeClass.java javac: release version 11 not  supported Usage: javac <options> <source files> use --help for a list of possible options 

I think this is an issue with the Ubuntu openjdk-11-jdk package:

➜  ~ sudo apt install openjdk-11-jdk Reading package lists... Done Building dependency tree        Reading state information... Done openjdk-11-jdk is already the newest version (10.0.1+10-3ubuntu1). 0 to upgrade, 0 to newly install, 0 to remove and 2 not to upgrade. 

Answer 1

mvn need JAVA_HOME to be set. I faced the same issue and setting up JAVA_HOME to correct JDK did the trick.