ignore Eclipse m2e warning about javacc-maven-plugin
diff --git a/pom.xml b/pom.xml
index 5741e0d..94044fe 100644
--- a/pom.xml
+++ b/pom.xml
@@ -85,6 +85,37 @@
                 </configuration>
             </plugin>
     </plugins>
+    <pluginManagement>
+        <plugins>
+            <!--This plugin's configuration is used to store Eclipse m2e settings only. It has no influence on the Maven build itself.-->
+            <plugin>
+                <groupId>org.eclipse.m2e</groupId>
+                <artifactId>lifecycle-mapping</artifactId>
+                <version>1.0.0</version>
+                <configuration>
+                    <lifecycleMappingMetadata>
+                        <pluginExecutions>
+                            <pluginExecution>
+                                <pluginExecutionFilter>
+                                    <groupId>org.codehaus.mojo</groupId>
+                                    <artifactId>
+                                        javacc-maven-plugin
+                                    </artifactId>
+                                    <versionRange>[2.5,)</versionRange>
+                                    <goals>
+                                        <goal>jjtree-javacc</goal>
+                                    </goals>
+                                </pluginExecutionFilter>
+                                <action>
+                                    <ignore></ignore>
+                                </action>
+                            </pluginExecution>
+                        </pluginExecutions>
+                    </lifecycleMappingMetadata>
+                </configuration>
+            </plugin>
+        </plugins>
+    </pluginManagement>
   </build>
 
     <dependencies>