diff --git a/build.xml b/build.xml
index 302fc7ac0..95ec2bef0 100644
--- a/build.xml
+++ b/build.xml
@@ -36,7 +36,8 @@
              classpathref="classpath"/>
     <!-- make sure the service class files are all compiled -->
     <javac srcdir="src/java" destdir="${classes.dir}"
-           debug="on" optimize="${build.optimize}" deprecation="on">
+           debug="on" optimize="${build.optimize}" deprecation="on"
+           source="1.4" target="1.4">
       <classpath refid="classpath"/>
       <include name="**/*Service.java"/>
       <exclude name="**/InvocationService.java"/>
@@ -84,7 +85,8 @@
   <!-- build the java class files -->
   <target name="compile" depends="prepare">
     <javac srcdir="src/java" destdir="${classes.dir}"
-           debug="on" optimize="{$build.optimize}" deprecation="on">
+           debug="on" optimize="{$build.optimize}" deprecation="on"
+           source="1.4" target="1.4">
       <classpath refid="classpath"/>
       <exclude name="**/OggPlayer.java"/>
       <exclude name="**/ModPlayer.java"/>
diff --git a/src/java/com/threerings/presents/tools/GenServiceTask.java b/src/java/com/threerings/presents/tools/GenServiceTask.java
index 45d9bbd1c..34ba53317 100644
--- a/src/java/com/threerings/presents/tools/GenServiceTask.java
+++ b/src/java/com/threerings/presents/tools/GenServiceTask.java
@@ -35,7 +35,7 @@ import com.threerings.presents.server.InvocationException;
 public class GenServiceTask extends InvocationTask
 {
     /** Used to keep track of custom InvocationListener derivations. */
-    public class ServiceListener implements Comparable<ServiceListener>
+    public class ServiceListener implements Comparable
     {
         public Class listener;
 
@@ -57,9 +57,9 @@ public class GenServiceTask extends InvocationTask
             methods.sort();
         }
 
-        public int compareTo (ServiceListener other)
+        public int compareTo (Object other)
         {
-            return getName().compareTo(other.getName());
+            return getName().compareTo(((ServiceListener)other).getName());
         }
 
         public boolean equals (Object other)
diff --git a/src/java/com/threerings/presents/tools/InvocationTask.java b/src/java/com/threerings/presents/tools/InvocationTask.java
index 3dbc2aae2..7c02e21cd 100644
--- a/src/java/com/threerings/presents/tools/InvocationTask.java
+++ b/src/java/com/threerings/presents/tools/InvocationTask.java
@@ -69,7 +69,7 @@ public abstract class InvocationTask extends Task
     }
 
     /** Used to keep track of invocation service methods. */
-    public class ServiceMethod implements Comparable<ServiceMethod>
+    public class ServiceMethod implements Comparable
     {
         public Method method;
 
@@ -154,9 +154,9 @@ public abstract class InvocationTask extends Task
             return (method.getParameterTypes().length > 1);
         }
 
-        public int compareTo (ServiceMethod other)
+        public int compareTo (Object other)
         {
-            return getCode().compareTo(other.getCode());
+            return getCode().compareTo(((ServiceMethod)other).getCode());
         }
 
         public String getUnwrappedArgList (boolean listenerMode)