"java.io.IOException: Class not found" when scan suspendable

[Gary Wu]

I am using quasar 0.7.3 in my project.  When I try to scan suspendable in ant task for one gradle sub project I got following error:

17:23:38.721 [ERROR] [org.gradle.api.internal.project.ant.AntLoggingAdapter] [ant:scanSuspendables] java.io.IOException: Class not found

java.lang.RuntimeException: java.io.IOException: Class not found

at co.paralleluniverse.fibers.instrument.SuspendablesScanner.run(SuspendablesScanner.java:218)

at co.paralleluniverse.fibers.instrument.SuspendablesScanner.execute(SuspendablesScanner.java:134)

at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:292)

at sun.reflect.GeneratedMethodAccessor540.invoke(Unknown Source)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:497)

at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)

at groovy.util.AntBuilder.performTask(AntBuilder.java:319)

......

Caused by: java.io.IOException: Class not found

at co.paralleluniverse.asm.ClassReader.a(Unknown Source)

at co.paralleluniverse.asm.ClassReader.<init>(Unknown Source)

at co.paralleluniverse.fibers.instrument.SuspendablesScanner$2.visit(SuspendablesScanner.java:230)

at co.paralleluniverse.common.reflection.ClassLoaderUtil.scanJar(ClassLoaderUtil.java:180)

at co.paralleluniverse.common.reflection.ClassLoaderUtil.scanFrom(ClassLoaderUtil.java:130)

at co.paralleluniverse.common.reflection.ClassLoaderUtil.accept(ClassLoaderUtil.java:111)

at co.paralleluniverse.common.reflection.ClassLoaderUtil.accept(ClassLoaderUtil.java:102)

at co.paralleluniverse.fibers.instrument.SuspendablesScanner.scanExternalSuspendables(SuspendablesScanner.java:223)

at co.paralleluniverse.fibers.instrument.SuspendablesScanner.run(SuspendablesScanner.java:187)

... 104 more

I've confirmed the class file is actually generated, anyone have any idea how to solve this issue, Thanks so much.

I am using following in build.gradle which I suppose is correct according to the quasar doc.

classes {
    doFirst {
        ant.taskdef(name: 'scanSuspendables',
                classname: 'co.paralleluniverse.fibers.instrument.SuspendablesScanner',
                classpath: "build/classes/main:build/resources/main:${configurations.runtime.asPath}")
        ant.scanSuspendables(auto: false,
                suspendablesFile: "$sourceSets.main.output.resourcesDir/META-INF/suspendables",
                supersFile: "$sourceSets.main.output.resourcesDir/META-INF/suspendable-supers",
                append: true) {
            fileset(dir: sourceSets.main.output.classesDir)
        }
    }
}

[Fabio Tudone]

I got similar error at times, they went away after clearing Gradle dirs named ".gradle" in the project's dir and/or in the user's home (better check that you don't have any important settings / other things in there before doing so).

Let me know if it helps.

-- Fabio

[Gary Wu]

Thanks Fabio. It works!

So looks like it is gradle's cache which lead to such issue.

在 2015年12月30日星期三 UTC+8下午7:38:08，Fabio Tudone写道：

[Fabio Tudone]

Glad it does, yes it seems so (but I don't know why).