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https://issues.apache.org/jira/browse/MNG-6800?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16969743#comment-16969743
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glmapper edited comment on MNG-6800 at 11/8/19 2:01 AM:
--------------------------------------------------------
h2. Background:
Write an idea plugin for maven project structure conversion
h2. Issue
I encountered a ClassCastException when I tried to use the API provided by
maven-model to add a plugin element in pom
details:
{code:java}
//代码占位符
Plugin plugin = new Plugin();
plugin.setGroupId("com.alipay.sofa");
plugin.setArtifactId("sofa-ark-maven-plugin");
plugin.setVersion("1.1.0-SNAPSHOT");
//1
final Xpp3Dom config = createPluginConfiguration();
plugin.setConfiguration(config);
model.getBuild().getPlugins().add(plugin);
FileWriter fileWriter = new FileWriter(pomPath);
//2
writer.write(fileWriter,model);
{code}
1.here, config object is loaded by PluginClassLoader（idea provided）
2.org.apache.maven.model.io.xpp3.MavenXpp3Writer#writePlugin:1417 version is
3.3.9,
{code:java}
//代码占位符
if ( plugin.getConfiguration() != null )
{
// 3
((Xpp3Dom) plugin.getConfiguration()).writeToSerializer( NAMESPACE,
serializer );
}
{code}
3. Xpp3Dom is loaded by URLClassLoader, so there will be throw
ClassCastException
In the ConfigurationContainer class, the configuration property type is Object,
But in actual processing, it will be converted to Xpp3Dom, why not directly use
Xpp3Dom as the type description of the configuration
was (Author: glmapper):
h2. Background:
Write an ide plugin for maven project structure conversion
h2. Issue
I encountered a ClassCastException when I tried to use the API provided by
maven-model to add a plugin element in pom
details:
{code:java}
//代码占位符
Plugin plugin = new Plugin();
plugin.setGroupId("com.alipay.sofa");
plugin.setArtifactId("sofa-ark-maven-plugin");
plugin.setVersion("1.1.0-SNAPSHOT");
//1
final Xpp3Dom config = createPluginConfiguration();
plugin.setConfiguration(config);
model.getBuild().getPlugins().add(plugin);
FileWriter fileWriter = new FileWriter(pomPath);
//2
writer.write(fileWriter,model);
{code}
1.here, config object is loaded by PluginClassLoader（idea provided）
2.org.apache.maven.model.io.xpp3.MavenXpp3Writer#writePlugin:1417 version is
3.3.9,
{code:java}
//代码占位符
if ( plugin.getConfiguration() != null )
{
// 3
((Xpp3Dom) plugin.getConfiguration()).writeToSerializer( NAMESPACE,
serializer );
}
{code}
3. Xpp3Dom is loaded by URLClassLoader, so there will be throw
ClassCastException
In the ConfigurationContainer class, the configuration property type is Object,
But in actual processing, it will be converted to Xpp3Dom, why not directly use
Xpp3Dom as the type description of configuration
> 在执行 writePlugin 时 发生 ClassCastException
> ----------------------------------------
>
> Key: MNG-6800
> URL: https://issues.apache.org/jira/browse/MNG-6800
> Project: Maven
> Issue Type: Improvement
> Components: Artifacts and Repositories
> Affects Versions: 3.3.9
> Reporter: glmapper
> Priority: Blocker
> Fix For: waiting-for-feedback
>
>
> {code:java}
> //代码占位符
> java.lang.ClassCastException: org.codehaus.plexus.util.xml.Xpp3Dom cannot be
> cast to org.codehaus.plexus.util.xml.Xpp3Domjava.lang.ClassCastException:
> org.codehaus.plexus.util.xml.Xpp3Dom cannot be cast to
> org.codehaus.plexus.util.xml.Xpp3Dom at
> org.apache.maven.model.io.xpp3.MavenXpp3Writer.writePlugin(MavenXpp3Writer.java:1417)
> at
> org.apache.maven.model.io.xpp3.MavenXpp3Writer.writeBuild(MavenXpp3Writer.java:329)
> at
> org.apache.maven.model.io.xpp3.MavenXpp3Writer.writeModel(MavenXpp3Writer.java:1115)
> at
> org.apache.maven.model.io.xpp3.MavenXpp3Writer.write(MavenXpp3Writer.java:100)
> {code}
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