"Java not enabled" in deployed app

53 次查看（过去 30 天）
chris
chris 2020-2-14
评论： Sabine Eckhardt 2020-3-5
To showcase the issue, consider the following simple function:
function checkJavaVersion
version -java
When I execute it in Matlab I receive the following result:
>> checkJavaVersion
ans =
'Java 1.8.0_202-b08 with Oracle Corporation Java HotSpot(TM) 64-Bit Server VM mixed mode'
Now I am using the Matlab Compiler to deploy this function:
mcc -m checkJavaVersion.m
And I execute it in a machine (the same one that built the function) with the Matlab Runtime installed:
./run_checkJavaVersion.sh /usr/local/MATLAB/MATLAB_Runtime/v97
And here is the response:
------------------------------------------
Setting up environment variables
---
LD_LIBRARY_PATH is .:/usr/local/MATLAB/MATLAB_Runtime/v97/runtime/glnxa64:/usr/local/MATLAB/MATLAB_Runtime/v97/bin/glnxa64:/usr/local/MATLAB/MATLAB_Runtime/v97/sys/os/glnxa64:/usr/local/MATLAB/MATLAB_Runtime/v97/sys/opengl/lib/glnxa64
ans =
'Java is not enabled'
How could Java be enabled in such a scenario?
  1 个评论
chris
chris 2020-2-14
I should also point out that this was tested on Ubuntu 19.10.

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

chris
chris 2020-2-17
In case anyone else encounters this issue of JVM not being available in compiled Matlab apps (e.g. due to compiling p-coded files) here is the solution:
From Matworks support:
"MATLAB Compiler, during the dependency analysis, actually tries to determine whether your application requires Java or not. If the analysis concludes your application does not require Java, Java support is indeed automatically disabled when you run the application, this is expected behavior; this increases startup performance and reduces resource (mainly memory) usage."
So in the aforementioned example one should modify the function to include a command that requires Java, e.g.:
function checkJavaVersion
% Actually do something using Java
javaString = java.lang.String('myString');
version -java
  2 个评论
Sabine Eckhardt
Sabine Eckhardt 2020-3-4
I think I am having exactly the same problem, however use R2019a and I get in the end not a succeed, but following message:
------------------------------------------
Setting up environment variables
---
LD_LIBRARY_PATH is .:/usr/local/MATLAB/MATLAB_Runtime/v96//runtime/glnxa64:/usr/local/MATLAB/MATLAB_Runtime/v96//bin/glnxa64:/usr/local/MATLAB/MATLAB_Runtime/v96//sys/os/glnxa64:/usr/local/MATLAB/MATLAB_Runtime/v96//sys/opengl/lib/glnxa64
Undefined variable "java" or class "java.lang.String".
Error in checkjava (line 2)
MATLAB:undefinedVarOrClass
Sabine Eckhardt
Sabine Eckhardt 2020-3-5
working after upgrading to R2019b

请先登录，再进行评论。

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Java Package Integration 的更多信息

标签

产品


版本

R2019b

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by