#550 ignore plugins which have not version in current POM but in pare…

…nt POM

src/it/it-display-plugin-updates-011-ignore-plugin-defined-in-parent/invoker.properties

@@ -0,0 +1 @@
+invoker.goals=${project.groupId}:${project.artifactId}:${project.version}:display-plugin-updates

src/it/it-display-plugin-updates-011-ignore-plugin-defined-in-parent/parent/pom.xml

@@ -0,0 +1,31 @@
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+
+  <groupId>localhost</groupId>
+  <artifactId>it-101-parent</artifactId>
+  <version>1.0</version>
+  <packaging>pom</packaging>
+  <name>display-plugin-updates-parent</name>
+
+  <build>
+    <pluginManagement>
+      <plugins>
+        <plugin>
+          <groupId>localhost</groupId>
+          <artifactId>dummy-maven-plugin</artifactId>
+          <version>1.0</version>
+        </plugin>
+        <plugin>
+          <artifactId>maven-install-plugin</artifactId>
+          <version>2.2</version>
+        </plugin>
+        <plugin>
+          <artifactId>maven-site-plugin</artifactId>
+          <version>2.0</version>
+        </plugin>
+      </plugins>
+    </pluginManagement>
+  </build>
+
+</project>

src/it/it-display-plugin-updates-011-ignore-plugin-defined-in-parent/pom.xml

@@ -0,0 +1,39 @@
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+
+  <parent>
+    <groupId>localhost</groupId>
+    <artifactId>it-101-parent</artifactId>
+    <version>1.0</version>
+    <relativePath>parent/pom.xml</relativePath>
+  </parent>
+
+  <groupId>localhost</groupId>
+  <artifactId>it-101</artifactId>
+  <version>1.0</version>
+  <packaging>pom</packaging>
+  <name>display-plugin-updates</name>
+
+  <description>Ignore plugin used in this POM without version, which has a version defined in a parent POM.</description>
+
+  <build>
+    <pluginManagement>
+      <plugins>
+        <plugin>
+          <groupId>localhost</groupId>
+          <artifactId>dummy-maven-plugin</artifactId>
+        </plugin>
+        <plugin>
+          <artifactId>maven-clean-plugin</artifactId>
+          <version>2.2</version>
+        </plugin>
+        <plugin>
+          <artifactId>maven-deploy-plugin</artifactId>
+          <version>2.3</version>
+        </plugin>
+      </plugins>
+    </pluginManagement>
+  </build>
+
+</project>

src/it/it-display-plugin-updates-011-ignore-plugin-defined-in-parent/verify.bsh

@@ -0,0 +1,25 @@
+import java.io.*;
+import org.codehaus.plexus.util.FileUtils;
+import java.util.regex.*;
+
+try
+{
+    File file = new File( basedir, "build.log" );
+    String buf = FileUtils.fileRead( file );
+
+    // output should not contain any message like 'localhost:dummy-maven-plugin .....' because this plugin should be ignored due to its version defined in parent POM
+    Pattern p = Pattern.compile( "\\Qlocalhost:dummy-maven-plugin\\E\\s*\\.+" );
+    Matcher m = p.matcher( buf.toString() );
+    if ( m.find() )
+    {
+        System.out.println( "dummy-maven-plugin should not be listed in output, version is defined in Parent POM" );
+        return false;
+    }
+}
+catch( Throwable t )
+{
+    t.printStackTrace();
+    return false;
+}
+
+return true;

src/main/java/org/codehaus/mojo/versions/DisplayPluginUpdatesMojo.java

@@ -404,6 +404,13 @@ public void execute()
             {
                 version = parentPlugins.get( coords );
             }
+
+            boolean versionSpecifiedInCurrentPom = pluginsWithVersionsSpecified.contains( coords );
+            if ( !versionSpecifiedInCurrentPom && parentPlugins.containsKey( coords ) ) {
+                getLog().debug( "Skip " + coords + ", version " + version + " is defined in parent POM." );
+                continue;
+            }
+
             getLog().debug( "Checking " + coords + " for updates newer than " + version );
             String effectiveVersion = version;
 
@@ -515,7 +522,7 @@ public void execute()
 
             String newVersion;
 
-            if ( version == null && pluginsWithVersionsSpecified.contains( coords ) )
+            if ( version == null && versionSpecifiedInCurrentPom )
             {
                 // Hack ALERT!
                 //
@@ -530,8 +537,8 @@ public void execute()
             getLog().debug( "[" + coords + "].version=" + version );
             getLog().debug( "[" + coords + "].artifactVersion=" + artifactVersion );
             getLog().debug( "[" + coords + "].effectiveVersion=" + effectiveVersion );
-            getLog().debug( "[" + coords + "].specified=" + pluginsWithVersionsSpecified.contains( coords ) );
-            if ( version == null || !pluginsWithVersionsSpecified.contains( coords ) )
+            getLog().debug( "[" + coords + "].specified=" + versionSpecifiedInCurrentPom );
+            if ( version == null || !versionSpecifiedInCurrentPom )
             {
                 version = superPomPluginManagement.get( coords );
                 getLog().debug( "[" + coords + "].superPom.version=" + version );