How to add options when compiling Java

[Yue Zhao]

I hope to use jdk11 to compile the source code of kythe through bazel, but some packages in the source code are not supported by default in jdk11. I need to add options such as "--add-exports jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED" to compile. How can I set it in BUILD or bazelrc file to achieve this effect?

[Rupert Shuttleworth]

Have you tried javacopts?

https://docs.bazel.build/versions/main/be/java.html#java_library

On Thu, Oct 21, 2021 at 7:27 PM Yue Zhao <zyn...@gmail.com> wrote:
>
> I hope to use jdk11 to compile the source code of kythe through bazel, but some packages in the source code are not supported by default in jdk11. I need to add options such as "--add-exports jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED" to compile. How can I set it in BUILD or bazelrc file to achieve this effect?
>

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[Olivier Notteghem]

I think what you want is ‘jvm_opts’ from java_toolchain() - https://docs.bazel.build/versions/main/be/java.html#java_toolchain

Something like :

java_toolchain(
  ...
  jvm_opts = ["--add-exports=jdk.compiler/com.sun.tools.javac.api=ALL-UNNAMED”]

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[Yue Zhao]

Yes, I found this configuration parameter, but now I have a new problem.

Now I set default_java_toolchain added the parameters I need. In BUILD.

load(

  "@bazel_tools//tools/jdk:default_java_toolchain.bzl",

  "default_java_toolchain", "DEFAULT_TOOLCHAIN_CONFIGURATION", "JDK9_JVM_OPTS", "DEFAULT_JAVACOPTS"

)

default_java_toolchain(

  name = "bootstrap_toolchain",

  #configuration = DEFAULT_TOOLCHAIN_CONFIGURATION,      # One of predefined configurations

                                                        # Other parameters are from java_toolchain rule:

  java_runtime = "@bazel_tools//tools/jdk:remote_jdk11",            # JDK to use for compilation and toolchain's tools execution

  jvm_opts = JDK9_JVM_OPTS + [

                "--add-exports=jdk.compiler/com.sun.tools.javac.code=ALL-UNNAMED",

                "--add-modules=java.base,java.compiler",

                "--add-exports=jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED",

            ],      # Additional JDK options

  javacopts = DEFAULT_JAVACOPTS, # Additional javac options

)

And it is set in the .bazelrc file

build --java_language_version=11

build --java_toolchain=@bazel_tools//tools/jdk:toolchain 

build --javabase=@bazel_tools//tools/jdk:remote_jdk11 

build --host_java_toolchain=@bazel_tools//tools/jdk:toolchain 

build --host_javabase=@bazel_tools//tools/jdk:remote_jdk11 

build:remote --host_javabase=@bazel_tools//tools/jdk:remote_jdk11 

build:remote --javabase=@bazel_tools//tools/jdk:remote_jdk11 

build:remote --host_java_toolchain=@bazel_tools//tools/jdk:toolchain 

build:remote --java_toolchain=@bazel_tools//tools/jdk:toolchain 

Now the compilation is successful, but it seems that all the java files still rely on jdk8 to compile after the compilation results are decompiled by javap - v

I don't understand why jdk11 is not used. Am I not configured correctly?

[Olivier Notteghem]

Try setting these in your toolchain directly : https://docs.bazel.build/versions/main/be/java.html#java_toolchain.target_version and https://docs.bazel.build/versions/main/be/java.html#java_toolchain.source_version 

<javap.png>

I don't understand why jdk11 is not used. Am I not configured correctly?

在2021年10月27日星期三 UTC+8 上午4:20:14<oliv...@uber.com> 写道：

I think what you want is ‘jvm_opts’ from java_toolchain() - https://docs.bazel.build/versions/main/be/java.html#java_toolchain

Something like :

java_toolchain(
  ...
  jvm_opts = ["--add-exports=jdk.compiler/com.sun.tools.javac.api=ALL-UNNAMED”]

On Oct 26, 2021, at 4:09 AM, 'Rupert Shuttleworth' via bazel-discuss <bazel-...@googlegroups.com> wrote:

Have you tried javacopts?

https://docs.bazel.build/versions/main/be/java.html#java_library

On Thu, Oct 21, 2021 at 7:27 PM Yue Zhao <zyn...@gmail.com> wrote:

I hope to use jdk11 to compile the source code of kythe through bazel, but some packages in the source code are not supported by default in jdk11. I need to add options such as "--add-exports jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED" to compile. How can I set it in BUILD or bazelrc file to achieve this effect?

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<javap.png>

[Yue Zhao]

I added such a configuration and did not modify other configurations.

Unfortunately, the compilation results have not changed. From the command javap -v, java files still rely on jdk8 to compile