Fixed mojohaus#308

 o Use raw model to update versions in dependency management.

src/it/it-use-dep-version-issue-308/invoker.properties

@@ -0,0 +1,2 @@
+invoker.goals=${project.groupId}:${project.artifactId}:${project.version}:use-dep-version -DdepVersion=3.0 -Dincludes=localhost:dummy-api
+

src/it/it-use-dep-version-issue-308/pom.xml

@@ -0,0 +1,20 @@
+<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-use-dep-version-issue-308</artifactId>
+  <version>1.0</version>
+  <packaging>pom</packaging>
+  <name>Set dependency to the specified version</name>
+
+  <dependencies>
+    <dependency>
+      <groupId>localhost</groupId>
+      <artifactId>dummy-api</artifactId>
+      <version>1.0</version>
+      <type>pom</type>
+      <scope>import</scope>
+    </dependency>
+  </dependencies>
+</project>

src/it/it-use-dep-version-issue-308/verify.bsh

@@ -0,0 +1,21 @@
+import java.io.*;
+import org.codehaus.plexus.util.FileUtils;
+
+try
+{
+    File file = new File( basedir, "pom.xml" );
+    String buf = FileUtils.fileRead( file, "UTF-8" );
+
+    if ( buf.indexOf( "<version>3.0</version>" ) < 0 )
+    {
+        System.err.println( "Version of dummy-api not bumped to 3.0" );
+        return false;
+    }
+}
+catch( Throwable t )
+{
+    t.printStackTrace();
+    return false;
+}
+
+return true;

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

@@ -1,5 +1,7 @@
 package org.codehaus.mojo.versions;
 
+import java.io.IOException;
+
 /*
  * Licensed to the Apache Software Foundation (ASF) under one
  * or more contributor license agreements.  See the NOTICE file
@@ -27,6 +29,7 @@
 import org.apache.maven.artifact.Artifact;
 import org.apache.maven.artifact.metadata.ArtifactMetadataRetrievalException;
 import org.apache.maven.model.Dependency;
+import org.apache.maven.model.DependencyManagement;
 import org.apache.maven.plugin.MojoExecutionException;
 import org.apache.maven.plugin.MojoFailureException;
 import org.apache.maven.plugins.annotations.Mojo;
@@ -77,7 +80,11 @@ protected void update( ModifiedPomXMLEventReader pom )
         {
             if ( getProject().getDependencyManagement() != null && isProcessingDependencyManagement() )
             {
-                useDepVersion( pom, getProject().getDependencyManagement().getDependencies() );
+                DependencyManagement dependencyManagement = PomHelper.getRawModel( getProject() ).getDependencyManagement();
+                if ( dependencyManagement != null )
+                {
+                    useDepVersion( pom, dependencyManagement.getDependencies() );
+                }
             }
 
             if ( getProject().getDependencies() != null && isProcessingDependencies() )
@@ -88,6 +95,8 @@ protected void update( ModifiedPomXMLEventReader pom )
         catch ( ArtifactMetadataRetrievalException e )
         {
             throw new MojoExecutionException( e.getMessage(), e );
+        } catch (IOException e) {
+            throw new MojoExecutionException( e.getMessage(), e );
         }
     }