diff --git a/ethereumj-core/pom.xml b/ethereumj-core/pom.xml
index ec658d75..0f8a2c44 100644
--- a/ethereumj-core/pom.xml
+++ b/ethereumj-core/pom.xml
@@ -193,7 +193,6 @@ mvn clean package -Dmaven.test.skip=true
                     </archive>
                 </configuration>
             </plugin>
-
             <plugin>
                 <artifactId>maven-antrun-plugin</artifactId>
                 <version>1.3</version>
@@ -214,9 +213,42 @@ mvn clean package -Dmaven.test.skip=true
                     </execution>
                 </executions>
             </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.apache.maven.plugins
+                                        </groupId>
+                                        <artifactId>
+                                            maven-dependency-plugin
+                                        </artifactId>
+                                        <versionRange>
+                                            [2.0,)
+                                        </versionRange>
+                                        <goals>
+                                            <goal>unpack</goal>
+                                        </goals>
+                                    </pluginExecutionFilter>
+                                    <action>
+                                        <ignore></ignore>
+                                    </action>
+                                </pluginExecution>
+                            </pluginExecutions>
+                        </lifecycleMappingMetadata>
+                    </configuration>
+                </plugin>
+            </plugins>
+        </pluginManagement>
 	</build>
+	
 </project>
diff --git a/ethereumj-core/src/test/java/org/ethereum/trie/MockDB.java b/ethereumj-core/src/test/java/org/ethereum/trie/MockDB.java
index 2ed8c9c3..bc5e4523 100644
--- a/ethereumj-core/src/test/java/org/ethereum/trie/MockDB.java
+++ b/ethereumj-core/src/test/java/org/ethereum/trie/MockDB.java
@@ -1,6 +1,9 @@
 package org.ethereum.trie;
 
 import java.io.IOException;
+import java.util.Map.Entry;
+import java.util.Spliterator;
+import java.util.function.Consumer;
 
 import org.iq80.leveldb.DB;
 import org.iq80.leveldb.DBException;
@@ -128,5 +131,17 @@ public class MockDB implements DB {
 	public int getAddedItems() {
 		return addedItems;
 	}
+
+	@Override
+	public void forEach(Consumer<? super Entry<byte[], byte[]>> action) {
+		// TODO Auto-generated method stub
+		
+	}
+
+	@Override
+	public Spliterator<Entry<byte[], byte[]>> spliterator() {
+		// TODO Auto-generated method stub
+		return null;
+	}
 	
 }
\ No newline at end of file