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mobility8/modules/org-netbeans-modules-mobility-antext.jar includes various Ant tasks. But this is supposed to be a NB module, which cannot directly access Ant at runtime. The tasks should either 1. Be moved into mobility8/ant/nblib/org-netbeans-modules-mobility-antext.jar, if they are intended to be run only from inside the IDE. 2. Be moved into a separate JAR file which is not directly referenced (via Class-Path) from the module. This would conventionally be in mobility8/ant/extra/*.jar. The current position causes a problem when running with -J-Dnetbeans.preresolve.classes=true (see nbbuild/build.xml#sanity-start), e.g. INFO [org.netbeans.core.modules]: Pre-resolving classes for all loaded modules...be sure you have not specified -J-Xverify:none in ide.cfg WARNING [org.netbeans.core.modules]: From org.netbeans.mobility.antext.ExtractTask in org.netbeans.modules.mobility.antext with effective classpath /space/jdk1.5.0_11/jre/lib/rt.jar:/space/jdk1.5.0_11/jre/lib/i18n.jar:/space/jdk1.5.0_11/jre/lib/sunrsasign.jar:/space/jdk1.5.0_11/jre/lib/jsse.jar:/space/jdk1.5.0_11/jre/lib/jce.jar:/space/jdk1.5.0_11/jre/lib/charsets.jar:/space/jdk1.5.0_11/jre/classes:/space/jdk1.5.0_11/jre/lib/ext/localedata.jar:/space/jdk1.5.0_11/jre/lib/ext/dnsns.jar:/space/jdk1.5.0_11/jre/lib/ext/sunjce_provider.jar:/space/jdk1.5.0_11/jre/lib/ext/sunpkcs11.jar:/space/src/nb_all/nbbuild/netbeans/platform7/lib/org-openide-modules.jar:/space/src/nb_all/nbbuild/netbeans/platform7/lib/org-openide-util.jar:/space/jdk5/lib/dt.jar:/space/jdk5/lib/tools.jar:/space/src/nb_all/nbbuild/netbeans/platform7/core/org-openide-filesystems.jar:/space/src/nb_all/nbbuild/netbeans/nb6.0/core/org-netbeans-upgrader.jar:/space/src/nb_all/nbbuild/netbeans/ide8/modules/org-netbeans-modules-classfile.jar[org.netbeans.modules.classfile.*]:/space/src/nb_all/nbbuild/netbeans/mobility8/modules/org-netbeans-api-mobility.jar[org.netbeans.spi.mobility.cfgfactory.*,org.netbeans.spi.mobility.cldcplatform.*,org.netbeans.spi.mobility.deployment.*]:/space/src/nb_all/nbbuild/netbeans/mobility8/modules/org-netbeans-modules-mobility-antext.jar java.lang.NoClassDefFoundError: org/apache/tools/ant/Task at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:620) at org.netbeans.JarClassLoader.simpleFindClass(JarClassLoader.java:180) at org.netbeans.ProxyClassLoader.smartLoadClass(ProxyClassLoader.java:550) at org.netbeans.ProxyClassLoader.loadClass(ProxyClassLoader.java:174) at java.lang.ClassLoader.loadClass(ClassLoader.java:251) at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:242) [catch] at org.netbeans.core.startup.NbInstaller.preresolveClasses(NbInstaller.java:1365) at org.netbeans.core.startup.NbInstaller.load(NbInstaller.java:290) at org.netbeans.ModuleManager.enable(ModuleManager.java:903) at org.netbeans.core.startup.ModuleList.installNew(ModuleList.java:380) at org.netbeans.core.startup.ModuleList.trigger(ModuleList.java:316) at org.netbeans.core.startup.ModuleSystem.restore(ModuleSystem.java:260) at org.netbeans.core.startup.Main.getModuleSystem(Main.java:149) at org.netbeans.core.startup.Main.start(Main.java:300) at org.netbeans.core.startup.TopThreadGroup.run(TopThreadGroup.java:88) at java.lang.Thread.run(Thread.java:595) [several more...]
I can fix it this way but does it help when the module will still reference the Ant library in its classpath? Mobility-AntExt is a library used in other modules as well as headless Ant extension.
What module references Ant in its classpath? (None should, since the user can pick an alternate Ant installation.) How do other modules use it as a library when its classes cannot even be resolved?
The requred classes can be resolved and it works. Split into a library, an Ant task library and module would complicate headless usage. The library is designed to be used headless outside IDE. Simply by copying the module jar everything works. The same approach is for example used in ProGuard obfuscator library. It is a bundle of obfuscator libarary and its Ant tasks. After the split user would need to copy multiple library files and arrange on a new possitions. BTW what is netbeans.preresolve.classes=true good for?
netbeans.preresolve.classes=true attempts to load every class in every module to see if it can really be resolved. It is correctly reporting that the Ant tasks in org-netbeans-modules-mobility-antext.jar cannot be resolved when loaded from the module class loader, because ant.jar is not visible to any module. That is, any attempt to refer to or load these task classes normally (from the module) would fail with a linkage error. The flag cannot, and does not attempt to, verify that classes are resolvable when referred to in other ways, such as from Ant or from manually constructed class loaders. I would still advise you to split apart the task classes into a separate JAR, as is done for every other collection of Ant tasks distributed with the IDE, but if you feel strongly that they must be present inside the module JAR then it would be possible to add an explicit exclude for classes matching a certain pattern.
The split requires to create three jars instead of one. Headless build configuration requires two of them + one optional jar to arrange on the classpath manually. I recommend to ignore this small architectural exception as it cause no harm.