带有 Maven Wrapper 的 Java 17 导致无法识别的 VM 选项“MaxPermSize=512m”

Question

I use OpenJDK 17 with Maven Wrapper 3.8.2 from Spring Initializr (Maven project, JAR packaging, Java 17, Spring Boot 2.6.0). No additional dependencies.

 user@DESKTOP-U2OU5HG MINGW64 /c/Projects/my-project (master) $ java -version openjdk version "17" 2021-09-14 OpenJDK Runtime Environment (build 17+35-2724) OpenJDK 64-Bit Server VM (build 17+35-2724, mixed mode, sharing)

Upon running any of ./mvnw.cmd -version or ./mvnw.cmd clean install , I always get the following message:

 Unrecognized VM option 'MaxPermSize=512m' Error: Could not create the Java Virtual Machine. Error: A fatal exception has occurred. Program will exit.

Switching to OpenJDK 16.0.2 resolves the issue, however, I need to work with Java 17.

How to get it run? There is nowhere MaxPermSize=512m set.

Answer 1

Indeed -XX:MaxPermSize=size is labelled as follows according to Java® Development Kit Version 16/17 Tool Specifications (see the links):

• For Java 16 it is obsolete .
• For Java 17 it is removed .

The Maven Wrapper in the mvnw.cmd script, however, aside from the required JAVA_HOME , uses also a bunch of optional environment variables such as M2_HOME and these starting with MAVEN_ prefix.

The important one is MAVEN_OPTS where such a removed Java option can appear causing the inability to start the JVM on the newer version. In my case, I had something like:

MAVEN_OPTS="-Xmx4g -XX:MaxPermSize=512m -Dfile.encoding=UTF-8"

The solution is either to remove the option from the environment variables or add this line to the Maven Wrapper script to override the MAVEN_OPTS value, In the minimal form:

MAVEN_OPTS=