diff --git a/android/core/build.xml b/android/core/build.xml
index 4b65683e3..baf67bfbe 100644
--- a/android/core/build.xml
+++ b/android/core/build.xml
@@ -24,7 +24,8 @@
     <methods dir="${basedir}/src/processing/core" recorder="false" />
 
     <mkdir dir="bin" />
-    <javac target="1.5" 
+    <javac source="1.6" 
+	   target="1.6" 
 	   encoding="UTF-8"
 	   includeAntRuntime="false"
 	   bootclasspath="${env.ANDROID_SDK}/platforms/android-10/android.jar"
diff --git a/core/build.xml b/core/build.xml
index 00acc0af3..79f3d90b5 100644
--- a/core/build.xml
+++ b/core/build.xml
@@ -13,7 +13,8 @@
     <methods dir="${basedir}/src/processing/core" recorder="true" />
 
     <mkdir dir="bin" />
-    <javac target="1.6" 
+    <javac source="1.6"
+	   target="1.6" 
 	   encoding="UTF-8"
 	   includeAntRuntime="false"
 	   debug="true"
diff --git a/java/libraries/dxf/build.xml b/java/libraries/dxf/build.xml
index a32e951e2..f059571e3 100644
--- a/java/libraries/dxf/build.xml
+++ b/java/libraries/dxf/build.xml
@@ -13,7 +13,8 @@
     <fail unless="core-built" message="Please build the core library first and make sure it sits in ../../../core/library/core.jar" />
     
     <mkdir dir="bin" />
-    <javac target="1.5" 
+    <javac source="1.6"
+	   target="1.6" 
 	   srcdir="src" destdir="bin" 
 	   encoding="UTF-8"
 	   includeAntRuntime="false"
diff --git a/java/libraries/net/build.xml b/java/libraries/net/build.xml
index 200067a0c..1766599ed 100644
--- a/java/libraries/net/build.xml
+++ b/java/libraries/net/build.xml
@@ -13,7 +13,8 @@
     <fail unless="core-built" message="Please build the core library first and make sure it sits in ../../../core/library/core.jar" />
     
     <mkdir dir="bin" />
-    <javac target="1.5" 
+    <javac source="1.6"
+	   target="1.6" 
 	   srcdir="src" destdir="bin" 
 	   encoding="UTF-8"
 	   includeAntRuntime="false"
diff --git a/java/libraries/pdf/build.xml b/java/libraries/pdf/build.xml
index c621a2f1f..322002993 100644
--- a/java/libraries/pdf/build.xml
+++ b/java/libraries/pdf/build.xml
@@ -13,7 +13,8 @@
     <fail unless="core-built" message="Please build the core library first and make sure it sits in ../../../core/library/core.jar" />
     
     <mkdir dir="bin" />
-    <javac target="1.5" 
+    <javac source="1.6"
+	   target="1.6" 
 	   srcdir="src" destdir="bin" 
 	   encoding="UTF-8"
 	   includeAntRuntime="false"
diff --git a/java/libraries/serial/build.xml b/java/libraries/serial/build.xml
index 288d79b51..887db84a0 100644
--- a/java/libraries/serial/build.xml
+++ b/java/libraries/serial/build.xml
@@ -13,7 +13,8 @@
     <fail unless="core-built" message="Please build the core library first and make sure it sits in ../../../core/library/core.jar" />
 
     <mkdir dir="bin" />
-    <javac target="1.5" 
+    <javac source="1.6"
+	   target="1.6" 
 	   srcdir="src" destdir="bin" 
 	   encoding="UTF-8"
 	   includeAntRuntime="false"
diff --git a/java/libraries/video/build.xml b/java/libraries/video/build.xml
index 5183a69d6..1bf2e5899 100644
--- a/java/libraries/video/build.xml
+++ b/java/libraries/video/build.xml
@@ -13,7 +13,8 @@
     <fail unless="core-built" message="Please build the core library first and make sure it sits in ../../../core/library/core.jar" />
 
     <mkdir dir="bin" />
-    <javac target="1.5" 
+    <javac source="1.6"
+	   target="1.6" 
 	   srcdir="src" destdir="bin" 
 	   encoding="UTF-8"
 	   includeAntRuntime="false"