[java] cleanup: get rid of fake packages in content modules of Java Frontend plugin (IDEA-366600)

Fake packages were used to ensure that the main plugin classloader is used to load the classes from content modules. Now the same can be achieved explicitly with loading="embedded" attribute. This is also needed to ensure that the classpath for content modules can be properly specified (this is needed for IJPL-165692).

Also, it's possible to use auto-layout for the plugin, so there is no need to specify it explicitly.

GitOrigin-RevId: 6a75b4868b796215018d230949752bc978c60476

java/debugger/shared/resources/intellij.java.debugger.impl.shared.xml

@@ -1,5 +1,4 @@
-<!--suppress PluginXmlValidity -->
-<idea-plugin package="com.intellij.java.debugger.impl.shared.fake">
+<idea-plugin>
   <extensions defaultExtensionNs="com.intellij">
     <applicationService serviceImplementation="com.intellij.debugger.settings.DebuggerSettings"/>
     <applicationSettings service="com.intellij.debugger.settings.DebuggerSettings"/>

java/debugger/shared/src/com/intellij/java/debugger/impl/shared/fake/placeholder.txt

@@ -1,2 +0,0 @@
-This file is added as a temporary workaround to have fake root package in intellij.java.debugger.impl.shared module.
-It can be removed when Java Frontend plugin is properly migrated to Plugin Model v2.

java/java-frontback-impl/resource/intellij.java.frontback.impl.xml

@@ -1,4 +1,4 @@
-<idea-plugin package="com.intellij.java.frontback.impl.fake">
+<idea-plugin>
   <module value="com.intellij.java.frontback.impl" />
   <extensionPoints>
     <!--suppress PluginXmlValidity -->

java/java-frontback-impl/src/com/intellij/java/frontback/impl/fake/placeholder.txt

@@ -1,2 +0,0 @@
-This file is added as a temporary workaround to have fake root package in intellij.java.frontback.impl module.
-It can be removed when Java Frontend plugin is properly migrated to Plugin Model v2.

java/java-frontback-psi-api/resources/intellij.java.frontback.psi.xml

@@ -1,2 +1,2 @@
-<idea-plugin package="com.intellij.java.frontback.psi.fake">
+<idea-plugin>
 </idea-plugin>

java/java-frontback-psi-api/src/com/intellij/java/frontback/psi/fake/placeholder.txt

@@ -1,2 +0,0 @@
-This file is added as a temporary workaround to have fake root package in intellij.java.frontback.psi module.
-It can be removed when Java Frontend plugin is properly migrated to Plugin Model v2.

java/java-frontback-psi-impl/resources/intellij.java.frontback.psi.impl.xml

@@ -1,4 +1,4 @@
-<idea-plugin package="com.intellij.java.frontback.psi.impl.fake">
+<idea-plugin>
   <module value="com.intellij.java.frontback.psi.impl" />
   <extensions defaultExtensionNs="com.intellij">
     <!--suppress PluginXmlValidity -->

java/java-frontback-psi-impl/src/com/intellij/java/frontback/psi/impl/fake/placeholder.txt

@@ -1,2 +0,0 @@
-This file is added as a temporary workaround to have fake root package in intellij.java.frontback.psi.impl module.
-It can be removed when Java Frontend plugin is properly migrated to Plugin Model v2.

platform/build-scripts/src/org/jetbrains/intellij/build/JavaPluginLayout.kt

@@ -6,7 +6,6 @@ import org.jetbrains.intellij.build.impl.PluginLayout
 
 object JavaPluginLayout {
   const val MAIN_MODULE_NAME = "intellij.java.plugin"
-  const val MAIN_FRONTEND_MODULE_NAME = "intellij.java.frontend"
 
   fun javaPlugin(addition: ((PluginLayout.PluginLayoutSpec) -> Unit)? = null): PluginLayout {
     return PluginLayout.plugin(mainModuleName = MAIN_MODULE_NAME, auto = true) { spec ->
@@ -107,19 +106,4 @@ object JavaPluginLayout {
       spec.excludeProjectLibrary("jetbrains-annotations-java5")
     }
   }
-
-  /**
-   * A special plugin for JetBrains Client
-   */
-  fun javaFrontendPlugin(): PluginLayout {
-    return PluginLayout.plugin(MAIN_FRONTEND_MODULE_NAME) { spec ->
-      @Suppress("SpellCheckingInspection")
-      spec.withModules(listOf(
-        "intellij.java.frontback.impl",
-        "intellij.java.frontback.psi",
-        "intellij.java.frontback.psi.impl",
-        "intellij.java.debugger.impl.shared",
-      ))
-    }
-  }
 }