Error when running gradlew build

[pepperoni42069]

Task :wasm FAILED
compiler: jwebassembly-master-SNAPSHOT.jar
WASM compile failed with: Abstract or native method can not be used: java/lang/ref/Reference.refersTo0(Ljava/lang/Object;)Z
If you want to use classes with native code, you must use a library that implements these native methods, such as 'de.inetsoftware:jwebassembly-api:+'.
at java.lang.ref.Reference.refersTo0(Reference.java)

FAILURE: Build failed with an exception.

• What went wrong:
  Execution failed for task ':wasm'.

Abstract or native method can not be used: java/lang/ref/Reference.refersTo0(Ljava/lang/Object;)Z
If you want to use classes with native code, you must use a library that implements these native methods, such as 'de.inetsoftware:jwebassembly-api:+'.
at java.lang.ref.Reference.refersTo0(Reference.java)

• Try:

Run with --stacktrace option to get the stack trace.
Run with --info or --debug option to get more log output.
Run with --scan to get full insights.

• Get more help at https://help.gradle.org

BUILD FAILED in 2s
3 actionable tasks: 3 executed

[pepperoni42069]

also is gradlew build even the right command

[Horcrux7]

Yes, you can use gradlew if you like it.

Which Java version do you use?

I have create a wiki page for this error to help with this typical problem.

[pepperoni42069]

i tried both java 8 and 17 both give me the same error

[pepperoni42069]

also here is the build.gradle :

buildscript {
    repositories {
        maven { url uri('https://jitpack.io') }
    }
    dependencies {
        classpath 'com.github.i-net-software:jwebassembly-gradle:master-SNAPSHOT'
    }
}

apply plugin: 'de.inetsoftware.jwebassembly'

repositories {
    maven { url 'https://jitpack.io' }
    mavenCentral()
}
dependencies {
    implementation 'de.inetsoftware:jwebassembly-api:0.4'
}

archivesBaseName = 'HelloWorld'


sourceSets {
    main {
        java {
            srcDir 'src/main/java'
        }
    }
}

wasm {
    //Get more debug information if there are problems.
    //logging.level = LogLevel.DEBUG
    //logging.levelInternal = LogLevel.DEBUG

    //Change the output format to the text format *.wat.
    //This can be helpful to understand the problems if you see the generated code as text format.
    //format = 'text'

    //The used JWebAssembly compiler version. The default is the latest release '+'.
    //You can set any valid Gradle version string or a full dependency string.
    //The snapshot version is recommended until a stable release.
    //compilerVersion = 0.2
    compilerVersion = 'com.github.i-net-software:jwebassembly:master-SNAPSHOT'

    //Write method and parameter names into the output *.wasm file.
    //The file will be approximate 10% larger. And it generate a source map.
    //With a source map you can see in the debugger of the browser your source code if available.
    debugNames = true

    //Set an absolute or relative path between the final wasm file location and the source files location.
    ///This is needed for debugging in the browser. It work only if debugNames = true.
    //sourceMapBase = '../../src/main/java/'
    //sourceMapBase = '/src/main/java/'

    //set the destination dir
    //destinationDir = file( 'targetDir' )
}

[Horcrux7]

• In Java 8 I can not find a method java/lang/ref/Reference.refersTo0() I expect that you have an error for a different method.
• Java 17 I have never try. The next step will be Java 11.
• The question is not how your Gradle script look like. The script seems to work. The problem is your Java code which you try to compile.
• Do you have analyze the debug output from the compiler?

[pepperoni42069]

I think the issue could be in: package de.inetsoftware.jwebassembly.web.JSObject.java. Line 18. Can't resolve symbol Nonnull.

[pepperoni42069]

im 99% sure that this is the issue, i changed my code to an example here and everything worked fine

[pepperoni42069]

heres the original code that didn't work.

`package org.pepperoni;

/*

• Copyright 2019 Volker Berlin (i-net software)
• Licensed under the Apache License, Version 2.0 (the "License");
• you may not use this file except in compliance with the License.
• You may obtain a copy of the License at

•  http://www.apache.org/licenses/LICENSE-2.0
  

• Unless required by applicable law or agreed to in writing, software
• distributed under the License is distributed on an "AS IS" BASIS,
• WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
• See the License for the specific language governing permissions and
• limitations under the License.
  */
  import de.inetsoftware.jwebassembly.api.annotation.Export;
  import de.inetsoftware.jwebassembly.web.dom.Document;
  import de.inetsoftware.jwebassembly.web.dom.HTMLElement;
  import de.inetsoftware.jwebassembly.web.dom.Text;
  import de.inetsoftware.jwebassembly.web.dom.Window;

public class HelloWorld {

@Export
public static void main() {
    Document document = Window.document();
    HTMLElement div = document.createElement("div");
    Text text = document.createTextNode("Hello World, this text come from WebAssembly.");
    div.appendChild( text );
    document.body().appendChild( div );
}

}
`

[pepperoni42069]

This is because JWebAssembly-API uses java 8, and javax.annoatation.Nonnull doesn't exist in newer vesrion. I will try and make pull request for java 17 compatability

[pepperoni42069]

Whats the exact jdk and jdk version you use?

[pepperoni42069]

I added // https://mvnrepository.com/artifact/com.google.code.findbugs/jsr305 implementation group: 'com.google.code.findbugs', name: 'jsr305', version: '3.0.2' to my build.gradle and everything works. You can either update the documentation for building with gradle in the wiki, or do some rewriting of JWebAssembly-API to make everything work without adding findbugs to build.gradle.

[Horcrux7]

Which error do you receive? The annotations are only needed at compile time. Try you to compile the library?

I does not understand what you means. In the start of this thread you point to java.lang.ref.Reference.refersTo0(Reference.java). Now you switch to javax.annoatation.Nonnull. I can not see any context between both.

[pepperoni42069]

I think this means, your trying to make a refernce to something that doesn't exist, javax.annoatation.Nonnull. Since i included a libary which has javax.annoatation.Nonnull it can resolve the refernce.

[Horcrux7]

Enable the debug log level and send the log output from compiler.

[pepperoni42069]

I already fixed the error but ok

[pepperoni42069]

acctualy nevermind it just decided to work without including fingbugs

[pepperoni42069]

ok