Help with ant warning during build

[David Garratt]

I am working on a OSX Mountain Lion Machine. I have exported the ant build.xml file from my Eclipse project. I have both java 1.6 (apple) and java 1.7 (oracle) installed however from the command prompt java 1.7 is the default. I need to keep my project compatible with Java 1.6 for now.

When I run the build I get the warning message :-

[javac] warning: [options] bootstrap class path not set in conjunction with -source 1.6

<?xml version="1.0" encoding="UTF-8" standalone="no"?> <!-- WARNING: Eclipse auto-generated file. Any modifications will be overwritten. To include a user specific buildfile here, simply create one in the same directory with the processing instruction <?eclipse.ant.import?> as the first entry and export the buildfile again. --><project basedir="." default="build" name="b4"> <property environment="env"/> <property name="ECLIPSE_HOME" value="../../eclipse_juno"/> <property name="debuglevel" value="source,lines,vars"/> <property name="target" value="1.6"/> <property name="source" value="1.6"/> <path id="b4.classpath"> <pathelement location="bin"/> <pathelement location="lib/app/commons-email-1.2.jar"/> <pathelement location="lib/app/commons-io-1.4.jar"/> <pathelement location="lib/app/commons-lang-2.4.jar"/> <pathelement location="lib/app/xercesImpl-2.7.0.jar"/> <pathelement location="lib/db/mysql-connector-java-5.1.8-bin.jar"/> <pathelement location="lib/db/ojdbc6.jar"/> <pathelement location="lib/db/sqljdbc4.jar"/> <pathelement location="lib/jasperlib/batik-anim.jar"/> <pathelement location="lib/jasperlib/batik-awt-util.jar"/> <pathelement location="lib/jasperlib/batik-bridge.jar"/> <pathelement location="lib/jasperlib/batik-css.jar"/> <pathelement location="lib/jasperlib/batik-dom.jar"/> <pathelement location="lib/jasperlib/batik-ext.jar"/> <pathelement location="lib/jasperlib/batik-gvt.jar"/> <pathelement location="lib/jasperlib/batik-parser.jar"/> <pathelement location="lib/jasperlib/batik-script.jar"/> <pathelement location="lib/jasperlib/batik-svg-dom.jar"/> <pathelement location="lib/jasperlib/batik-svggen.jar"/> <pathelement location="lib/jasperlib/batik-util.jar"/> <pathelement location="lib/jasperlib/batik-xml.jar"/> <pathelement location="lib/jasperlib/bcel-5.2.jar"/> <pathelement location="lib/jasperlib/castor-1.2.jar"/> <pathelement location="lib/jasperlib/commons-digester-2.1.jar"/> <pathelement location="lib/jasperlib/commons-javaflow-20060411.jar"/> <pathelement location="lib/jasperlib/groovy-all-1.7.5.jar"/> <pathelement location="lib/jasperlib/hibernate3.jar"/> <pathelement location="lib/jasperlib/hsqldb-1.8.0-10.jar"/> <pathelement location="lib/jasperlib/iText-2.1.7.jar"/> <pathelement location="lib/jasperlib/jackson-core-asl-1.9.4.jar"/> <pathelement location="lib/jasperlib/jackson-mapper-asl-1.9.4.jar"/> <pathelement location="lib/jasperlib/jaxen-1.1.1.jar"/> <pathelement location="lib/jasperlib/jcommon-1.0.15.jar"/> <pathelement location="lib/jasperlib/jdt-compiler-3.1.1.jar"/> <pathelement location="lib/jasperlib/jfreechart-1.0.12.jar"/> <pathelement location="lib/jasperlib/jpa.jar"/> <pathelement location="lib/jasperlib/jxl-2.6.10.jar"/> <pathelement location="lib/jasperlib/log4j-1.2.15.jar"/> <pathelement location="lib/jasperlib/png-encoder-1.5.jar"/> <pathelement location="lib/jasperlib/poi-3.7-20101029.jar"/> <pathelement location="lib/jasperlib/poi-ooxml-3.7-20101029.jar"/> <pathelement location="lib/jasperlib/poi-ooxml-schemas-3.7-20101029.jar"/> <pathelement location="lib/jasperlib/rhino-1.7R1.jar"/> <pathelement location="lib/jasperlib/saaj-api-1.3.jar"/> <pathelement location="lib/jasperlib/velocity-1.7-dep.jar"/> <pathelement location="lib/jasperlib/xbean.jar"/> <pathelement location="lib/jasperlib/xml-apis-ext.jar"/> <pathelement location="lib/jasperlib/xml-apis.jar"/> <pathelement location="lib/mail/dsn.jar"/> <pathelement location="lib/mail/imap.jar"/> <pathelement location="lib/mail/mailapi.jar"/> <pathelement location="lib/mail/pop3.jar"/> <pathelement location="lib/mail/smtp.jar"/> <pathelement location="lib/service/wrapper.jar"/> <pathelement location="lib/cups4j/cups4j.runnable-0.6.3.jar"/> <pathelement location="lib/jasperlib/ant-1.7.1.jar"/> <pathelement location="lib/jasperlib/antlr-2.7.5.jar"/> <pathelement location="lib/jasperlib/barbecue-1.5-beta1.jar"/> <pathelement location="lib/jasperlib/barcode4j-2.1.jar"/> <pathelement location="lib/jasperlib/bsh-2.0b4.jar"/> <pathelement location="lib/jasperlib/commons-beanutils-1.8.0.jar"/> <pathelement location="lib/jasperlib/commons-collections-2.1.1.jar"/> <pathelement location="lib/jasperlib/commons-logging-1.1.1.jar"/> <pathelement location="lib/jasperlib/dom4j-1.6.1.jar"/> <pathelement location="lib/jasperlib/mondrian-3.1.1.12687.jar"/> <pathelement location="lib/jasperlib/serializer.jar"/> <pathelement location="lib/jasperlib/servlet-api-2.4.jar"/> <pathelement location="lib/jasperlib/spring-beans-2.5.5.jar"/> <pathelement location="lib/jasperlib/spring-core-2.5.5.jar"/> <pathelement location="lib/jasperlib/xalan-2.7.1.jar"/> <pathelement location="lib/jasperlib/xercesImpl-2.7.0.jar"/> <pathelement location="lib/jasper/jasperreports-4.7.1.jar"/> <pathelement location="lib/jasper/jasperreports-applet-4.7.1.jar"/> <pathelement location="lib/jasper/jasperreports-fonts-4.7.1.jar"/> <pathelement location="lib/jasper/jasperreports-javaflow-4.7.1.jar"/> <pathelement location="lib/barcode/avalon-framework-4.2.0.jar"/> </path> <target name="init"> <mkdir dir="bin"/> <copy includeemptydirs="false" todir="bin"> <fileset dir="src"> <exclude name="**/*.launch"/> <exclude name="**/*.java"/> </fileset> </copy> </target> <target name="clean"> <delete dir="bin"/> </target> <target depends="clean" name="cleanall"/> <target depends="build-subprojects,build-project" name="build"/> <target name="build-subprojects"/> <target depends="init" name="build-project"> <echo message="${ant.project.name}: ${ant.file}"/> <javac debug="true" debuglevel="${debuglevel}" destdir="bin" includeantruntime="false" source="${source}" target="${target}"> <src path="src"/> <classpath refid="b4.classpath"/> </javac> </target> <target description="Build all projects which reference this project. Useful to propagate changes." name="build-refprojects"/> <target description="copy Eclipse compiler jars to ant lib directory" name="init-eclipse-compiler"> <copy todir="${ant.library.dir}"> <fileset dir="${ECLIPSE_HOME}/plugins" includes="org.eclipse.jdt.core_*.jar"/> </copy> <unzip dest="${ant.library.dir}"> <patternset includes="jdtCompilerAdapter.jar"/> <fileset dir="${ECLIPSE_HOME}/plugins" includes="org.eclipse.jdt.core_*.jar"/> </unzip> </target> <target description="compile project with Eclipse compiler" name="build-eclipse-compiler"> <property name="build.compiler" value="org.eclipse.jdt.core.JDTCompilerAdapter"/> <antcall target="build"/> </target> <target name="JFrameHostAdmin"> <java classname="com.commander4j.cfg.JFrameHostAdmin" failonerror="true" fork="yes"> <classpath refid="b4.classpath"/> </java> </target> <target name="Setup"> <java classname="com.commander4j.cfg.Setup" failonerror="true" fork="yes"> <classpath refid="b4.classpath"/> </java> </target> <target name="Start"> <java classname="com.commander4j.sys.Start" failonerror="true" fork="yes"> <classpath refid="b4.classpath"/> </java> </target> </project>


My attempts at googling this message or fragments of it have not proved very helpful - I'm assuming that it's (maybe) something to do with me running the java 1.7 compiler on a project flagged for 1.6 - but that just a guess.

If someone could give me some idea of what I need (if anything) to do in order to correct this it would be most helpful.

My java 1.7 is installed in this location :- /Library/Java/JavaVirtualMachines/jdk1.7.0_10.jdk
My java 1.6 is installed in this location :- /System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home


Dave

[David Garratt]

Further research has found this which seems to confirm my suspicions https://blogs.oracle.com/darcy/entry/how_to_cross_compile_for

However I am a little unsure about the syntax (path) I need to use.

I have the path /System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents to my Apple 1.6 JDK - but it has a number of directories under it and I'm unsure which of these I need to reference.

I've also stumbled across /System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Classes which maybe an alternative as well.

Dave

[David Garratt]

In case it helps anyone I think I have the solution as follows:-

<?xml version="1.0" encoding="UTF-8" standalone="no"?> <!-- WARNING: Eclipse auto-generated file. Any modifications will be overwritten. To include a user specific buildfile here, simply create one in the same directory with the processing instruction <?eclipse.ant.import?> as the first entry and export the buildfile again. --><project basedir="." default="build" name="b4"> <property environment="env"/> <property name="ECLIPSE_HOME" value="../../eclipse_juno"/> <property name="debuglevel" value="source,lines,vars"/> <property name="target" value="1.6"/> <property name="source" value="1.6"/> <property name="bootclasspath" value="/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Classes/classes.jar"/> <path id="b4.classpath"> <pathelement location="bin"/> <pathelement location="lib/app/commons-email-1.2.jar"/> <pathelement location="lib/app/commons-io-1.4.jar"/> <pathelement location="lib/app/commons-lang-2.4.jar"/> <pathelement location="lib/app/xercesImpl-2.7.0.jar"/> <pathelement location="lib/db/mysql-connector-java-5.1.8-bin.jar"/> <pathelement location="lib/db/ojdbc6.jar"/> <pathelement location="lib/db/sqljdbc4.jar"/> <pathelement location="lib/jasperlib/batik-anim.jar"/> <pathelement location="lib/jasperlib/batik-awt-util.jar"/> <pathelement location="lib/jasperlib/batik-bridge.jar"/> <pathelement location="lib/jasperlib/batik-css.jar"/> <pathelement location="lib/jasperlib/batik-dom.jar"/> <pathelement location="lib/jasperlib/batik-ext.jar"/> <pathelement location="lib/jasperlib/batik-gvt.jar"/> <pathelement location="lib/jasperlib/batik-parser.jar"/> <pathelement location="lib/jasperlib/batik-script.jar"/> <pathelement location="lib/jasperlib/batik-svg-dom.jar"/> <pathelement location="lib/jasperlib/batik-svggen.jar"/> <pathelement location="lib/jasperlib/batik-util.jar"/> <pathelement location="lib/jasperlib/batik-xml.jar"/> <pathelement location="lib/jasperlib/bcel-5.2.jar"/> <pathelement location="lib/jasperlib/castor-1.2.jar"/> <pathelement location="lib/jasperlib/commons-digester-2.1.jar"/> <pathelement location="lib/jasperlib/commons-javaflow-20060411.jar"/> <pathelement location="lib/jasperlib/groovy-all-1.7.5.jar"/> <pathelement location="lib/jasperlib/hibernate3.jar"/> <pathelement location="lib/jasperlib/hsqldb-1.8.0-10.jar"/> <pathelement location="lib/jasperlib/iText-2.1.7.jar"/> <pathelement location="lib/jasperlib/jackson-core-asl-1.9.4.jar"/> <pathelement location="lib/jasperlib/jackson-mapper-asl-1.9.4.jar"/> <pathelement location="lib/jasperlib/jaxen-1.1.1.jar"/> <pathelement location="lib/jasperlib/jcommon-1.0.15.jar"/> <pathelement location="lib/jasperlib/jdt-compiler-3.1.1.jar"/> <pathelement location="lib/jasperlib/jfreechart-1.0.12.jar"/> <pathelement location="lib/jasperlib/jpa.jar"/> <pathelement location="lib/jasperlib/jxl-2.6.10.jar"/> <pathelement location="lib/jasperlib/log4j-1.2.15.jar"/> <pathelement location="lib/jasperlib/png-encoder-1.5.jar"/> <pathelement location="lib/jasperlib/poi-3.7-20101029.jar"/> <pathelement location="lib/jasperlib/poi-ooxml-3.7-20101029.jar"/> <pathelement location="lib/jasperlib/poi-ooxml-schemas-3.7-20101029.jar"/> <pathelement location="lib/jasperlib/rhino-1.7R1.jar"/> <pathelement location="lib/jasperlib/saaj-api-1.3.jar"/> <pathelement location="lib/jasperlib/velocity-1.7-dep.jar"/> <pathelement location="lib/jasperlib/xbean.jar"/> <pathelement location="lib/jasperlib/xml-apis-ext.jar"/> <pathelement location="lib/jasperlib/xml-apis.jar"/> <pathelement location="lib/mail/dsn.jar"/> <pathelement location="lib/mail/imap.jar"/> <pathelement location="lib/mail/mailapi.jar"/> <pathelement location="lib/mail/pop3.jar"/> <pathelement location="lib/mail/smtp.jar"/> <pathelement location="lib/service/wrapper.jar"/> <pathelement location="lib/cups4j/cups4j.runnable-0.6.3.jar"/> <pathelement location="lib/jasperlib/ant-1.7.1.jar"/> <pathelement location="lib/jasperlib/antlr-2.7.5.jar"/> <pathelement location="lib/jasperlib/barbecue-1.5-beta1.jar"/> <pathelement location="lib/jasperlib/barcode4j-2.1.jar"/> <pathelement location="lib/jasperlib/bsh-2.0b4.jar"/> <pathelement location="lib/jasperlib/commons-beanutils-1.8.0.jar"/> <pathelement location="lib/jasperlib/commons-collections-2.1.1.jar"/> <pathelement location="lib/jasperlib/commons-logging-1.1.1.jar"/> <pathelement location="lib/jasperlib/dom4j-1.6.1.jar"/> <pathelement location="lib/jasperlib/mondrian-3.1.1.12687.jar"/> <pathelement location="lib/jasperlib/serializer.jar"/> <pathelement location="lib/jasperlib/servlet-api-2.4.jar"/> <pathelement location="lib/jasperlib/spring-beans-2.5.5.jar"/> <pathelement location="lib/jasperlib/spring-core-2.5.5.jar"/> <pathelement location="lib/jasperlib/xalan-2.7.1.jar"/> <pathelement location="lib/jasperlib/xercesImpl-2.7.0.jar"/> <pathelement location="lib/jasper/jasperreports-4.7.1.jar"/> <pathelement location="lib/jasper/jasperreports-applet-4.7.1.jar"/> <pathelement location="lib/jasper/jasperreports-fonts-4.7.1.jar"/> <pathelement location="lib/jasper/jasperreports-javaflow-4.7.1.jar"/> <pathelement location="lib/barcode/avalon-framework-4.2.0.jar"/> </path> <target name="init"> <mkdir dir="bin"/> <copy includeemptydirs="false" todir="bin"> <fileset dir="src"> <exclude name="**/*.java"/> </fileset> </copy> </target> <target name="clean"> <delete dir="bin"/> </target> <target depends="clean" name="cleanall"/> <target depends="build-subprojects,build-project" name="build"/> <target name="build-subprojects"/> <target depends="init" name="build-project"> <echo message="${ant.project.name}: ${ant.file}"/> <javac debug="true" debuglevel="${debuglevel}" destdir="bin" includeantruntime="false" source="${source}" target="${target}" bootclasspath="${bootclasspath}"> <src path="src"/> <classpath refid="b4.classpath"/> </javac> </target> <target description="Build all projects which reference this project. Useful to propagate changes." name="build-refprojects"/> <target description="copy Eclipse compiler jars to ant lib directory" name="init-eclipse-compiler"> <copy todir="${ant.library.dir}"> <fileset dir="${ECLIPSE_HOME}/plugins" includes="org.eclipse.jdt.core_*.jar"/> </copy> <unzip dest="${ant.library.dir}"> <patternset includes="jdtCompilerAdapter.jar"/> <fileset dir="${ECLIPSE_HOME}/plugins" includes="org.eclipse.jdt.core_*.jar"/> </unzip> </target> <target description="compile project with Eclipse compiler" name="build-eclipse-compiler"> <property name="build.compiler" value="org.eclipse.jdt.core.JDTCompilerAdapter"/> <antcall target="build"/> </target> <target name="JFrameHostAdmin"> <java classname="com.commander4j.cfg.JFrameHostAdmin" failonerror="true" fork="yes"> <classpath refid="b4.classpath"/> </java> </target> <target name="Setup"> <java classname="com.commander4j.cfg.Setup" failonerror="true" fork="yes"> <classpath refid="b4.classpath"/> </java> </target> <target name="Start"> <java classname="com.commander4j.sys.Start" failonerror="true" fork="yes"> <classpath refid="b4.classpath"/> </java> </target> </project>