Crash java.lang.IllegalStateException: must set env JAVA_HOME

Question

Crash java.lang.IllegalStateException: must set env JAVA_HOME

neo-expert opened this issue 4 years ago · comments

On my Linux machine JAVA_HOME is not set, the JVM crashes with following error:

$ java -jar jvm-core/target/mini-jvm.jar -jar jvm-core/target/mini-jvm.jar -jar test.jar
Exception in thread "main" java.lang.IllegalStateException: must set env JAVA_HOME
        at com.gxk.jvm.util.Utils.classpath(Utils.java:263)           at com.gxk.jvm.VirtualMachine.run(VirtualMachine.java:58)                                                                   at com.gxk.jvm.Main.main(Main.java:28)

guxingke · Answer 1 · Mon Feb 10 2020 10:22:05 GMT+0800 (China Standard Time)

yes , it depends on a classpath, the oracle jdk8 classpath on my macos machine .

i want hack standard lib as little as possible , so my mini-jdk just hack 3 class .

in other words, mini-jvm must depends on another classpath .

neoexpert · Answer 2 · Mon Feb 10 2020 21:22:43 GMT+0800 (China Standard Time)

Can you implement a fallback for the case if JAVA_HOME is not set? Maybe set the classpath to current directory?
Because on my machine it is not set even though Java is installed.

guxingke · Answer 3 · Thu Feb 13 2020 19:34:53 GMT+0800 (China Standard Time)

Yes, it's good for the user, but I'm not going to do it.

There are a lot of corner case to deal with, I choose to fail-fast, not keep running.

Thanks for the advice.