samuelowino opened a new issue, #791:
URL: https://github.com/apache/maven-shade-plugin/issues/791
### Affected version
3.6.1
### Bug description
# GitHub Issue: Support for Java 25 Class Files (Major Version 69)
---
**Issue Title:** Add support for Java 25 class files (major version 69)
**Description:**
## Problem
When building projects with Java 25, the Maven Shade Plugin fails with the
following error:
**pom.xml**
```xml
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>3.6.1</version>
<configuration>
<minimizeJar>true</minimizeJar>
<transformers>
<transformer
implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
<mainClass>com.owino.desktop.AppGUI</mainClass>
</transformer>
</transformers>
</configuration>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
</execution>
</executions>
</plugin>
```
```
[ERROR] Failed to execute goal
org.apache.maven.plugins:maven-shade-plugin:3.6.1:shade (default) on project
my-project: Error creating shaded jar: Unsupported class file major version 69
Caused by: java.lang.IllegalArgumentException: Unsupported class file major
version 69
```
```java
[ERROR] Failed to execute goal
org.apache.maven.plugins:maven-shade-plugin:3.6.1:shade (default) on project
osqa: Error creating shaded jar: Unsupported class file major version 69 ->
[Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute
goal org.apache.maven.plugins:maven-shade-plugin:3.6.1:shade (default) on
project osqa: Error creating shaded jar: Unsupported class file major version 69
at org.apache.maven.lifecycle.internal.MojoExecutor.doExecute2
(MojoExecutor.java:333)
at org.apache.maven.lifecycle.internal.MojoExecutor.doExecute
(MojoExecutor.java:316)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute
(MojoExecutor.java:212)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute
(MojoExecutor.java:174)
at org.apache.maven.lifecycle.internal.MojoExecutor.access$000
(MojoExecutor.java:75)
at org.apache.maven.lifecycle.internal.MojoExecutor$1.run
(MojoExecutor.java:162)
at org.apache.maven.plugin.DefaultMojosExecutionStrategy.execute
(DefaultMojosExecutionStrategy.java:39)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute
(MojoExecutor.java:159)
at
org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject
(LifecycleModuleBuilder.java:105)
at
org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject
(LifecycleModuleBuilder.java:73)
at
org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build
(SingleThreadedBuilder.java:53)
at org.apache.maven.lifecycle.internal.LifecycleStarter.execute
(LifecycleStarter.java:118)
at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:261)
at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:173)
at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:101)
at org.apache.maven.cli.MavenCli.execute (MavenCli.java:903)
at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:280)
at org.apache.maven.cli.MavenCli.main (MavenCli.java:203)
at jdk.internal.reflect.DirectMethodHandleAccessor.invoke
(DirectMethodHandleAccessor.java:104)
at java.lang.reflect.Method.invoke (Method.java:565)
at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced
(Launcher.java:255)
at org.codehaus.plexus.classworlds.launcher.Launcher.launch
(Launcher.java:201)
at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode
(Launcher.java:361)
at org.codehaus.plexus.classworlds.launcher.Launcher.main
(Launcher.java:314)
Caused by: org.apache.maven.plugin.MojoExecutionException: Error creating
shaded jar: Unsupported class file major version 69
at org.apache.maven.plugins.shade.mojo.ShadeMojo.execute
(ShadeMojo.java:663)
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo
(DefaultBuildPluginManager.java:126)
at org.apache.maven.lifecycle.internal.MojoExecutor.doExecute2
(MojoExecutor.java:328)
at org.apache.maven.lifecycle.internal.MojoExecutor.doExecute
(MojoExecutor.java:316)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute
(MojoExecutor.java:212)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute
(MojoExecutor.java:174)
at org.apache.maven.lifecycle.internal.MojoExecutor.access$000
(MojoExecutor.java:75)
at org.apache.maven.lifecycle.internal.MojoExecutor$1.run
(MojoExecutor.java:162)
at org.apache.maven.plugin.DefaultMojosExecutionStrategy.execute
(DefaultMojosExecutionStrategy.java:39)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute
(MojoExecutor.java:159)
at
org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject
(LifecycleModuleBuilder.java:105)
at
org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject
(LifecycleModuleBuilder.java:73)
at
org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build
(SingleThreadedBuilder.java:53)
at org.apache.maven.lifecycle.internal.LifecycleStarter.execute
(LifecycleStarter.java:118)
at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:261)
at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:173)
at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:101)
at org.apache.maven.cli.MavenCli.execute (MavenCli.java:903)
at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:280)
at org.apache.maven.cli.MavenCli.main (MavenCli.java:203)
at jdk.internal.reflect.DirectMethodHandleAccessor.invoke
(DirectMethodHandleAccessor.java:104)
at java.lang.reflect.Method.invoke (Method.java:565)
at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced
(Launcher.java:255)
at org.codehaus.plexus.classworlds.launcher.Launcher.launch
(Launcher.java:201)
at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode
(Launcher.java:361)
at org.codehaus.plexus.classworlds.launcher.Launcher.main
(Launcher.java:314)
Caused by: java.lang.IllegalArgumentException: Unsupported class file major
version 69
at org.vafer.jdeb.shaded.objectweb.asm.ClassReader.<init>
(ClassReader.java:200)
at org.vafer.jdeb.shaded.objectweb.asm.ClassReader.<init>
(ClassReader.java:180)
at org.vafer.jdeb.shaded.objectweb.asm.ClassReader.<init>
(ClassReader.java:166)
at org.vafer.jdeb.shaded.objectweb.asm.ClassReader.<init>
(ClassReader.java:288)
at org.vafer.jdependency.Clazzpath.addClazzpathUnit (Clazzpath.java:179)
at org.vafer.jdependency.Clazzpath.addClazzpathUnit (Clazzpath.java:151)
at org.apache.maven.plugins.shade.filter.MinijarFilter.<init>
(MinijarFilter.java:104)
at org.apache.maven.plugins.shade.mojo.ShadeMojo.getFilters
(ShadeMojo.java:992)
at org.apache.maven.plugins.shade.mojo.ShadeMojo.execute
(ShadeMojo.java:521)
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo
(DefaultBuildPluginManager.java:126)
at org.apache.maven.lifecycle.internal.MojoExecutor.doExecute2
(MojoExecutor.java:328)
at org.apache.maven.lifecycle.internal.MojoExecutor.doExecute
(MojoExecutor.java:316)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute
(MojoExecutor.java:212)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute
(MojoExecutor.java:174)
at org.apache.maven.lifecycle.internal.MojoExecutor.access$000
(MojoExecutor.java:75)
at org.apache.maven.lifecycle.internal.MojoExecutor$1.run
(MojoExecutor.java:162)
at org.apache.maven.plugin.DefaultMojosExecutionStrategy.execute
(DefaultMojosExecutionStrategy.java:39)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute
(MojoExecutor.java:159)
at
org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject
(LifecycleModuleBuilder.java:105)
at
org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject
(LifecycleModuleBuilder.java:73)
at
org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build
(SingleThreadedBuilder.java:53)
at org.apache.maven.lifecycle.internal.LifecycleStarter.execute
(LifecycleStarter.java:118)
at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:261)
at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:173)
at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:101)
at org.apache.maven.cli.MavenCli.execute (MavenCli.java:903)
at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:280)
at org.apache.maven.cli.MavenCli.main (MavenCli.java:203)
at jdk.internal.reflect.DirectMethodHandleAccessor.invoke
(DirectMethodHandleAccessor.java:104)
at java.lang.reflect.Method.invoke (Method.java:565)
at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced
(Launcher.java:255)
at org.codehaus.plexus.classworlds.launcher.Launcher.launch
(Launcher.java:201)
at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode
(Launcher.java:361)
at org.codehaus.plexus.classworlds.launcher.Launcher.main
(Launcher.java:314)
[ERROR]
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please
read the following articles:
[ERROR] [Help 1]
http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException
```
## Analysis
The error occurs because the ASM library bundled with the Maven Shade Plugin
doesn't yet support Java 25 class files (major version 69). Even though version
3.6.1 was previously updated to support Java 25 , the error persists,
indicating that the ASM version needs further updates.
| Major Version | Java Release |
|--------------|--------------|
| 65 | Java 21 |
| 66 | Java 22 |
| 67 | Java 23 |
| 68 | Java 24 |
| **69** | **Java 25** |
## 💻 Steps to Reproduce
1. Set up a project using Java 25 (early access)
2. Configure the Maven Shade Plugin (any version up to 3.6.1)
3. Run `mvn clean package`
4. Observe the error when the plugin attempts to process class files
## 📋 Expected Behavior
The Maven Shade Plugin should successfully process Java 25 class files
without throwing an `Unsupported class file major version` exception.
## 🛠️ Suggested Fix
Update the embedded ASM library to a version that supports Java 25 class
files. According to the ASM version mapping:
- ASM 9.7+ should support Java 25 (major version 69)
## 🔗 Related Issues
- Similar issue reported in Apache Flink:
[FLINK-38391](https://issues.apache.org/jira/browse/FLINK-38391)
- Community discussions on Stack Overflow
## 📦 Environment
- Maven Shade Plugin Version: 3.6.1 (and earlier)
- Java Version: 25 (early access/preview)
- Maven Version: Any
## 💡 Workaround
I was able to work around this by:
1. Disabling `<minimizeJar>true</minimizeJar>`
2. Adding ASM 9.7+ as a plugin dependency
```java
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>3.6.1</version>
<dependencies>
<dependency>
<groupId>org.ow2.asm</groupId>
<artifactId>asm</artifactId>
<version>9.9.1</version>
</dependency>
<dependency>
<groupId>org.ow2.asm</groupId>
<artifactId>asm-commons</artifactId>
<version>9.9.1</version>
</dependency>
</dependencies>
<configuration>
<minimizeJar>false</minimizeJar>
<transformers>
<transformer
implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
<mainClass>com.owino.desktop.AppGUI</mainClass>
</transformer>
</transformers>
</configuration>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
</execution>
</executions>
</plugin>
```
However, a permanent fix in the plugin would be preferable.
Gracias!
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