add findbugs-exclude.xml

build.xml

@@ -285,7 +285,8 @@
         <mkdir dir="${findbugs.results}"/>
         <findbugs home="${findbugs.home}"
             output="xml"
-            outputFile="${findbugs.results}/results.xml" >
+            excludeFilter="${basedir}/findbugs-exclude.xml"
+            outputFile="${findbugs.results}/results.xml" reportLevel='high'>
            <sourcePath path="${source}" />
            <sourcePath path="${thrift.out.dir}" />
            <class location="${build}" />
@@ -298,8 +299,10 @@
     <target name="findbugs" depends="init,compile">
         <taskdef name="findbugs" classname="edu.umd.cs.findbugs.anttask.FindBugsTask" classpath="${findbugs.home}/lib/findbugs-ant.jar"/>
         <mkdir dir="${findbugs.results}"/>
+        <echo message="${basedir}/findbugs-exclude.xml"/>
         <findbugs home="${findbugs.home}"
             output="html"
+            excludeFilter="${basedir}/findbugs-exclude.xml"
             outputFile="${findbugs.results}/results.html" >
            <sourcePath path="${source}" />
            <sourcePath path="${thrift.out.dir}" />

findbugs-exclude.xml

+<FindBugsFilter>
+    <!--- Checks disabled on generated code -->
+    <Match>
+        <!-- don't complain about switch statements / external representation exposed
+             by generated parser files -->
+        <Class name="~net\.bigdb\.(query|yang)\.parser\..*(Lexer|Parser)" />
+        <Bug pattern="SF_SWITCH_NO_DEFAULT,EI_EXPOSE_REP" />
+    </Match>
+
+    <!-- checks disabled because of too many false positives -->
+    <Match>
+            <!-- BC_UNFIRMED_CAST complains about too many pseudo violations, where
+             we know an object is of a specific type (e.g., by checking the type field
+             of an openflow message -->
+        <Bug pattern="BC_UNCONFIRMED_CAST" />
+    </Match>
+
+    <!-- checks disabled because they are just not important -->
+    <Match>
+        <!-- RCN_REDUNDANT_NULLCHECK_OF_NONNULL_VALUE is not an important check -->
+            <Bug pattern="RCN_REDUNDANT_NULLCHECK_OF_NONNULL_VALUE" />
+    </Match>
+</FindBugsFilter>