TeaVM: how to compile jar to javascript?

[jsfan3]

Thank you very much for developing TeaVM!

TeaVM aims to make "java bytecode" to "javascript" easy, so I suppose that converting a Java app composed by three jars to a web app should be easy.

The problem is that I didn't find in the TeaVM documentation any help. I need step by step instructions, I've never used Maven before and I'd like to automatize "jar to web app" with scripting.

Thank you very much for any help :-)

[konsoletyper]

The one possibility is: install these jar files into Maven local repository. Another is to use system scope for your dependencies (this is deprecated in modern Maven). See this question on StackOverflow.

[jsfan3]

My java app is composed by these three files:
Main.jar
lib/app.jar
lib/JavaSEClean.jar

and I can run it with
java -jar Main.jar

In the directory "webapp", inside my home directory, I've done:

mvn -DarchetypeCatalog=local
-DarchetypeGroupId=org.teavm
-DarchetypeArtifactId=teavm-maven-webapp
-DarchetypeVersion=0.5.0
archetype:generate

Define value for property 'groupId': com.mycompany.demos
Define value for property 'artifactId': my-first-app
Define value for property 'version': 0.1
Define value for property 'package': com.mycompany.demos

Then, according to the StackOverflow discussion you mentioned, I added the following lines to my-first-app/pom.xml:

<dependency>
<!-- My App Main file -->
<groupId>com.mycompany.demos</groupId>
<artifactId>my-first-app</artifactId>
<version>0.1</version>
<scope>system</scope>
<systemPath>/home/francesco/app/Main.jar</systemPath>
</dependency>

<dependency>
<!-- My App library file 1 -->
<groupId>com.mycompany.demos</groupId>
<artifactId>my-first-app-lib1</artifactId>
<version>0.1</version>
<scope>system</scope>
<systemPath>/home/francesco/app/lib/app.jar</systemPath>
</dependency>

<dependency>
<!-- My App library file 2 -->
<groupId>com.mycompany.demos</groupId>
<artifactId>my-first-app-lib2</artifactId>
<version>0.1</version>
<scope>system</scope>
<systemPath>/home/francesco/app/lib/JavaSEClean.jar</systemPath>
</dependency>

I also changed the line "com.mycompany.demos.Client" with the mainClass specified in the file /META-INF/MANIFEST.MF inside Main.jar

I removed the directory that contains source code, because in this case it's not used:
rm -Rf ./my-first-app/src/main/java

Finally:
cd my-first-app
mvn -e clean package

It worked for a while, downloading a lot of files, then it ends with the error in the attached log. I'm a newbie of Maven and TeaVM, please help me. Thank you very much.

log.txt

[konsoletyper]

I don't have your project, I event don't know what is your pom.xml, that's why I can't tell why TeaVM does not report errors properly. However, from the information in your log file, I can tell that you have to give up! Looks like your jar file uses parts of Java class library unsupported by TeaVM, java.security.AccessController, sun.awt.DebugSettings in particular. You won't be able to compile this application without modification, and, since you don't have source files, you can't modify it. You better look at another project that matches your use-case, like Doppio or CheerpJ. TeaVM merely was not designed for that. TeaVM is mostly replacement for GWT, it's useful for creating small and fast webapps from scratch, not for running fat applets without rewriting the code.

[jsfan3]

Thank you, I realized what you wrote.

[TorutheRedFox]

since you don't have source files, you can't modify it.

if it's not obfuscated, you can without much difficulty ;P