[maven][IDEA-340182] use default plugin groupid in case if plugin groupid is not set in pom

GitOrigin-RevId: 478103a9490270e2625b66cefb447d1bf33af025

plugins/maven/src/main/java/org/jetbrains/idea/maven/project/preimport/MavenProjectPreImporter.kt

@@ -490,7 +490,8 @@ class MavenProjectPreImporter(val project: Project, val coroutineScope: Coroutin
                          } ?: emptyList()
 
       val id = extractId(it)
-      val plugin = MavenPlugin(id.groupId, id.artifactId, id.version, false, false, it.getChild("configuration"), executions, emptyList())
+      val groupId = id.groupId.nullize(true) ?: "org.apache.maven.plugins"
+      val plugin = MavenPlugin(groupId, id.artifactId, id.version, false, false, it.getChild("configuration"), executions, emptyList())
       plugins[trimVersion(id)] = plugin
     }
     return plugins

plugins/maven/src/test/java/org/jetbrains/idea/maven/importing/MavenPreimportingTest.kt

@@ -216,6 +216,33 @@ class MavenPreimportingTest : MavenMultiVersionImportingTestCase() {
     }
   }
 
+  @Test
+  fun testImportProjectWithCompilerConfigWithoutGroupId() = runBlocking {
+    importProjectAsync("""
+                    <groupId>test</groupId>
+                    <artifactId>project</artifactId>
+                    <version>1</version>
+                    <build>
+                      <plugins>
+                        <plugin>
+                          <artifactId>maven-compiler-plugin</artifactId>
+                          <version>3.11.0</version>
+                          <configuration>
+                            <source>14</source>
+                            <target>14</target>
+                          </configuration>
+                        </plugin>
+                      </plugins>
+                    </build>
+                    """.trimIndent())
+
+
+    readAction {
+      val module = getModule("project")
+      assertEquals(LanguageLevel.JDK_14, LanguageLevelUtil.getEffectiveLanguageLevel(module))
+    }
+  }
+
   @Test
   fun testImportProjectWithCompilerConfigOfParent() = runBlocking {