Comments (4)
omac777
commented on May 28, 2024
If you don't set the correct environment variables, you'll encounter the following error:
javac com/example/robusta/HelloWorld.java && RUST_BACKTRACE=full java -Djava.library.path=../target/debug com.example.robusta.HelloWorld
Error: LinkageError occurred while loading main class com.example.robusta.HelloWorld
java.lang.UnsupportedClassVersionError: com/example/robusta/HelloWorld has been compiled by a more recent version of the Java Runtime (class file version 60.0), this version of the Java Runtime only recognizes class file versions up to 55.0
The above install and export commands resolve this issue.
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giovanniberti
commented on May 28, 2024
Thanks for the issue!
Yes, javac and java should be on your PATH in order to run the examples, I'll add this prerequisite in the README.
I did try to reproduce it the issue docker by pulling the fedora:rawhide image, but couldn't:
$ dnf install make cargo git java-latest-openjdk-demo java-latest-openjdk-devel
-- snip --
$ echo $PATH
/root/.local/bin:/root/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
$ git clone https://github.com/giovanniberti/robusta.git
-- snip --
$ cd robusta/robusta-example/
$ make java_run
-- snip --
javac com/example/robusta/HelloWorld.java && RUST_BACKTRACE=full java -Djava.library.path=../target/debug com.example.robusta.HelloWorld
[1, 2, 3, 4]
3
3
The second message you posted makes me suspect that you had a Java 11 installation (which the java command pointed to) alongside the Java 16 installation you just installed (from which javac was invoked), thus causing a UnsupportedClassVersionError.
Could you perhaps investigate whether that's the case?
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omac777
commented on May 28, 2024
On 4/8/21 4:48 PM, Giovanni Berti wrote:
Thanks for the issue!
Yes, `javac` and `java` should be on your PATH in order to run the examples, I'll add this prerequisite in the README.
I did try to reproduce it the issue `docker` by pulling the `fedora:rawhide`, but I couldn't:
```
$ dnf install make cargo git java-latest-openjdk-demo java-latest-openjdk-devel
-- snip --
$ echo $PATH
/root/.local/bin:/root/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
$ git clone https://github.com/giovanniberti/robusta.git
-- snip --
$ cd robusta/robusta-example/
$ make java_run
-- snip --
javac com/example/robusta/HelloWorld.java && RUST_BACKTRACE=full java -Djava.library.path=../target/debug com.example.robusta.HelloWorld
[1, 2, 3, 4]
3
3
```
The second message you posted makes me suspect that you had a Java 11 installation (which the `java` command pointed to) alongside the Java 16 installation (from which `javac` was invoked), thus causing a `UnsupportedClassVersionError`.
Could you perhaps investigate whether that's the case?
Yes I do have a java 11 installation in fact there are a few java
installations and I suspect that I am like other linux users that have
older versions still installed and haven't removed those packages for
whatever their reasons like legacy production compatibility or simply
never got around to it.
That's why I felt it important mentioning this bug. Cheers.
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giovanniberti
commented on May 28, 2024
Understood. I added a section in the README about running the example (7e989e0), I hope that will be enough!
Thank you for taking the time to open an issue about it
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