error: failed to run custom build command for `i-slint-backend-android-activity v1.5.0` about slint

[ogoffart]

Thanks for reporting an issue.

We call javac in the build script to build our bundled java.
It seems to complain that javac doesn't support the --release command line args.

What is your version of Java?
Can you run javac -version and javac -help

Is the JAVA_HOME env variable defined? (Slint will find javac from $JAVA_HOME/bin/javac if it exists, otherwise it will use the one from the $PATH

[huangbqsky]

Thanks for reporting an issue.

We call javac in the build script to build our bundled java. It seems to complain that javac doesn't support the --release command line args.

What is your version of Java? Can you run javac -version and javac -help

Is the JAVA_HOME env variable defined? (Slint will find javac from $JAVA_HOME/bin/javac if it exists, otherwise it will use the one from the $PATH

❯ javac -version
javac 1.8.0_311

javac -help
用法: javac <options> <source files>
其中, 可能的选项包括:
  -g                         生成所有调试信息
  -g:none                    不生成任何调试信息
  -g:{lines,vars,source}     只生成某些调试信息
  -nowarn                    不生成任何警告
  -verbose                   输出有关编译器正在执行的操作的消息
  -deprecation               输出使用已过时的 API 的源位置
  -classpath <路径>            指定查找用户类文件和注释处理程序的位置
  -cp <路径>                   指定查找用户类文件和注释处理程序的位置
  -sourcepath <路径>           指定查找输入源文件的位置
  -bootclasspath <路径>        覆盖引导类文件的位置
  -extdirs <目录>              覆盖所安装扩展的位置
  -endorseddirs <目录>         覆盖签名的标准路径的位置
  -proc:{none,only}          控制是否执行注释处理和/或编译。
  -processor <class1>[,<class2>,<class3>...] 要运行的注释处理程序的名称; 绕过默认的搜索进程
  -processorpath <路径>        指定查找注释处理程序的位置
  -parameters                生成元数据以用于方法参数的反射
  -d <目录>                    指定放置生成的类文件的位置
  -s <目录>                    指定放置生成的源文件的位置
  -h <目录>                    指定放置生成的本机标头文件的位置
  -implicit:{none,class}     指定是否为隐式引用文件生成类文件
  -encoding <编码>             指定源文件使用的字符编码
  -source <发行版>              提供与指定发行版的源兼容性
  -target <发行版>              生成特定 VM 版本的类文件
  -profile <配置文件>            请确保使用的 API 在指定的配置文件中可用
  -version                   版本信息
  -help                      输出标准选项的提要
  -A关键字[=值]                  传递给注释处理程序的选项
  -X                         输出非标准选项的提要
  -J<标记>                     直接将 <标记> 传递给运行时系统
  -Werror                    出现警告时终止编译

[ogoffart]

I see, it looks like --release argument was only added in Java 9.

[huangbqsky]

> JAVA_HOME

➜  /usr/libexec/java_home -V
Matching Java Virtual Machines (3):
    1.8.401.10 (x86_64) "Oracle Corporation" - "Java" /Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home
    1.8.0_311 (x86_64) "Oracle Corporation" - "Java SE 8" /Library/Java/JavaVirtualMachines/jdk1.8.0_311.jdk/Contents/Home
    1.8.0_192 (x86_64) "Oracle Corporation" - "Java SE 8" /Library/Java/JavaVirtualMachines/jdk1.8.0_192.jdk/Contents/Home
/Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home
(base) 
~ 
➜ which java
/Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home/bin/java
(base) 
~ 
➜ whereis java
java: /usr/bin/java
(base) 
~ 
➜ java -version
java version "1.8.0_401"
Java(TM) SE Runtime Environment (build 1.8.0_401-b10)
Java HotSpot(TM) 64-Bit Server VM (build 25.401-b10, mixed mode)
(base) 
~ 
➜ javac -version
javac 1.8.0_311
(base) 

[ogoffart]

I'm trying a fix in #4908 , could you please try it (since i don't have that version of java i cannot try it)

Change your code to this:

Cargo.toml

# ...

[dependencies]
slint = { version = "1.5.1", git = "https://github.com/slint-ui/slint" branch = "olivier/fix-4904", features = ["backend-android-activity-05"]}
# REMOVE i-slint-backend-android-activity

lib.rs (use the symbols from slint::android instead of i-slint-backend-android-activity)

#[cfg(target_os = "android")]
#[no_mangle]
fn android_main(app: slint::android::AndroidApp) {
    slint::android::init(app).unwrap();
    // ... rest of your code ...
    slint::slint!{
        export component MainWindow inherits Window {
            Text { text: "Hello World"; }
        }
    }
    MainWindow::new().unwrap().run().unwrap();
}

[huangbqsky]

#[cfg(target_os = "android")]
#[no_mangle]
fn android_main(app: slint::android::AndroidApp) {
    slint::android::init(app).unwrap();
    // ... rest of your code ...
    slint::slint!{
        export component MainWindow inherits Window {
            Text { text: "Hello World"; }
        }
    }
    MainWindow::new().unwrap().run().unwrap();
}

➜ cargo  apk run --target aarch64-linux-android --lib
Using package `slint_android` in `/Users/xxx/Slint/slint_android/Cargo.toml`
   Compiling skia-safe v0.71.0
   Compiling i-slint-backend-android-activity v1.5.1 (https://github.com/slint-ui/slint?branch=olivier/fix-4904#6cbd3f5e)
error: failed to run custom build command for `i-slint-backend-android-activity v1.5.1 (https://github.com/slint-ui/slint?branch=olivier/fix-4904#6cbd3f5e)`

Caused by:
  process didn't exit successfully: `/Users/xxx/Slint/slint_android/target/debug/build/i-slint-backend-android-activity-a913a6d424a9e029/build-script-build` (exit status: 101)
  --- stdout
  cargo:rerun-if-env-changed=ANDROID_HOME
  cargo:rerun-if-env-changed=JAVA_HOME

  --- stderr
  thread 'main' panicked at /Users/xxx/.cargo/git/checkouts/slint-8153123e5dffa129/6cbd3f5/internal/backends/android-activity/build.rs:44:13:
  Could not locate the java compiler. Please ensure that the JAVA_HOME environment variable is set correctly.
  note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

[ogoffart]

That's strange that this fails to find java now while it worked before.
Did you change the definition of JAVA_HOME?
Maybe you need to define it to /Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home (based on your previous comment)

[ogoffart]

I merged the patch to master already.
So now you need to change the branch to master if you'd like to test this:

slint = { git = "https://github.com/slint-ui/slint" branch = "master", features = ["backend-android-activity-05"]}

I didn't test with with Java8, so your testing would be apreciated. Let me know if it works.
So now

[huangbqsky]

That's strange that this fails to find java now while it worked before. Did you change the definition of JAVA_HOME? Maybe you need to define it to /Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home (based on your previous comment)

# Setting JAVA_HOME in .bash_profile 
export JAVA_HOME=$(/usr/libexec/java_home)
export PATH=$JAVA_HOME/bin:$PATH
export CLASS_PATH=$JAVA_HOME/lib

testing command:

➜ echo $JAVA_HOME
/Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home
(base) 
~ 
➜ /usr/libexec/java_home                     
/Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home
(base) 
~ 
➜ /usr/libexec/java_home --exec java -version
java version "1.8.0_401"
Java(TM) SE Runtime Environment (build 1.8.0_401-b10)
Java HotSpot(TM) 64-Bit Server VM (build 25.401-b10, mixed mode)
(base) 
~ 
➜  /usr/libexec/java_home -V                
Matching Java Virtual Machines (3):
    1.8.401.10 (x86_64) "Oracle Corporation" - "Java" /Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home
    1.8.0_311 (x86_64) "Oracle Corporation" - "Java SE 8" /Library/Java/JavaVirtualMachines/jdk1.8.0_311.jdk/Contents/Home
    1.8.0_192 (x86_64) "Oracle Corporation" - "Java SE 8" /Library/Java/JavaVirtualMachines/jdk1.8.0_192.jdk/Contents/Home
/Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home
(base) 

[ogoffart]

So do $JAVA_HOME/bin/javac exist?
And what is the error when you try to compile now?

[huangbqsky]

So do $JAVA_HOME/bin/javac exist? And what is the error when you try to compile now?

➜ echo $JAVA_HOME/bin/javac
/Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home/bin/javac

❯ cargo clean
Removed 4716 files, 1.7GiB total
(base)
slint_android on  master [?] via 🦀 v1.75.0

➜ cargo apk run --target aarch64-linux-android --lib
Using package slint_android in /Users/xxx/Slint/slint_android/Cargo.toml

error: failed to run custom build command for i-slint-backend-android-activity v1.5.1 (https://github.com/slint-ui/slint?branch=master#fb0046c2)

Caused by:
process didn't exit successfully: /Users/xxx/Slint/slint_android/target/debug/build/i-slint-backend-android-activity-b2e2e0d3daac1bb8/build-script-build (exit status: 101)
--- stdout
cargo:rerun-if-env-changed=ANDROID_HOME
cargo:rerun-if-env-changed=JAVA_HOME

--- stderr
thread 'main' panicked at /Users/xxx/.cargo/git/checkouts/slint-8153123e5dffa129/fb0046c/internal/backends/android-activity/build.rs:44:13:
Could not locate the java compiler. Please ensure that the JAVA_HOME environment variable is set correctly.
note: run with RUST_BACKTRACE=1 environment variable to display a backtrace

[ogoffart]

How about file $JAVA_HOME/bin/javac (checking if the file actually exist) ?

[huangbqsky]

How about file $JAVA_HOME/bin/javac (checking if the file actually exist) ?

Thank you for your guidance. I specified the Java version as v 1.8.0_311, and then $JAVA_HOME/bin/javac also exists. Now I'm getting an error message saying "The detected Java version is too old. The minimum required version is Java 8. Your Java version: "" (parsed as 0)". Does this mean that the official support for Java 8 has been discontinued?

# Setting JAVA_HOME

export JAVA_HOME=$(/usr/libexec/java_home -v 1.8.0_311)
export PATH=$JAVA_HOME/bin:$PATH
export CLASS_PATH=$JAVA_HOME/lib

testing command：

❯ $JAVA_HOME/bin/javac -version
javac 1.8.0_311

❯ cargo  apk run --target aarch64-linux-android --lib
Using package `slint_android` in `/Users/xxx/Slint/slint_android/Cargo.toml`
   Compiling i-slint-backend-android-activity v1.5.1 (https://github.com/slint-ui/slint?branch=master#fb0046c2)
error: failed to run custom build command for `i-slint-backend-android-activity v1.5.1 (https://github.com/slint-ui/slint?branch=master#fb0046c2)`

Caused by:
  process didn't exit successfully: `/Users/xxx/Slint/slint_android/target/debug/build/i-slint-backend-android-activity-b2e2e0d3daac1bb8/build-script-build` (exit status: 101)
  --- stdout
  cargo:rerun-if-env-changed=ANDROID_HOME
  cargo:rerun-if-env-changed=JAVA_HOME

  --- stderr
  thread 'main' panicked at /Users/xxx/.cargo/git/checkouts/slint-8153123e5dffa129/fb0046c/internal/backends/android-activity/build.rs:63:9:
  **_The detected Java version is too old. The minimum required version is Java 8. Your Java version: "" (parsed as 0)_**
  note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

[ogoffart]

Java 8 should work.
I'm trying to parse the output of javac -version to detect it.
But it turned out that the older version of javac used the stderr instead of the stdout.
Just made commit a61cf52 in master to address that.