javac -nowarn doesn't have the desired effect with JDK 1.5/1.6

h2/build.bat

@@ -2,6 +2,6 @@
 if "%JAVA_HOME%"=="" echo Error: JAVA_HOME is not defined.
 if exist bin/org/h2/build/Build.class goto buildOK
 if not exist bin mkdir bin
-javac -nowarn -sourcepath src/tools -d bin src/tools/org/h2/build/*.java
+javac -sourcepath src/tools -d bin src/tools/org/h2/build/*.java
 :buildOK
 java -Xmx512m -cp "bin;%JAVA_HOME%/lib/tools.jar;temp" org.h2.build.Build %1 %2 %3 %4 %5
\ No newline at end of file

h2/build.sh

@@ -6,6 +6,6 @@ if [ ! -f "bin/org/h2/build/Build.class" ] ; then
   if [ ! -d "bin" ] ; then
     mkdir bin
   fi
-  javac -nowarn -sourcepath src/tools -d bin src/tools/org/h2/build/*.java
+  javac -sourcepath src/tools -d bin src/tools/org/h2/build/*.java
 fi
 java -Xmx512m -cp "bin:$JAVA_HOME/lib/tools.jar:temp" org.h2.build.Build $@

h2/build.xml

@@ -14,7 +14,7 @@
 	</target>
 
 	<target name="compile" depends="switchSourceAuto, resources, download">
-		<javac destdir="bin" nowarn="true" debug="true" debuglevel="lines,source" >
+		<javac destdir="bin" debug="true" debuglevel="lines,source" >
 			<classpath location="ext/servlet-api-2.4.jar" />
 		    <classpath location="ext/lucene-core-2.2.0.jar" />
 		    <classpath location="ext/slf4j-api-1.5.0.jar" />
@@ -108,7 +108,7 @@
 	</target>
 
 	<target name="switchSourcePrepare" depends="clean">
-		<javac srcdir="src/tools" destdir="bin" debug="true" nowarn="true" debuglevel="lines,source" includes="org/h2/build/code/SwitchSource.java"/>
+		<javac srcdir="src/tools" destdir="bin" debug="true" debuglevel="lines,source" includes="org/h2/build/code/SwitchSource.java"/>
 	</target>
 
     <target name="switchSourceAndroid" depends="switchSourcePrepare">