Hi, I had a look into that, and the solution boils down to using the same classloader for classes loaded from s4r archives and for classes dynamically generated. The JarLoader needs a small modification to handle that. It is now possible to load several apps concurrently, including apps from the s4-example subproject.
I'll share my changes tomorrow so we can discuss and see what the next steps are. Matthieu On Sun, Oct 23, 2011 at 4:53 AM, Leo Neumeyer <[email protected]> wrote: > I made some progress getting the app to load. The problem was a > missing no-args constructor to get the newInstance method to work. > (Apps will be required to have a no-args constructor.) Once the app > starts, there is an exception because the CounterPE is not found. It > looks like a conflict between dynamic app loading and dynamic > dispatching. More debugging needed, here is the trace: > > comm.module=org.apache.s4.comm.Module > s4.logger_level=TRACE > comm.queue_emmiter_size=8000 > comm.queue_listener_size=8000 > cluster.hosts=localhost > cluster.ports=5077 > cluster.lock_dir=/tmp > cluster.isCluster=true > 19:43:53.281 [main] TRACE org.apache.s4.core.Server - Read: > > file:/Users/leo/Projects/s4project/s4-piper/subprojects/s4-core/bin/apps/CounterExample.s4r > 19:43:53.297 [main] DEBUG o.a.s4.base.util.MultiClassLoader - > MultiClassLoader loadClass - className: > org.apache.s4.example.counter.MyApp, resolveIt: true > 19:43:53.297 [main] DEBUG o.a.s4.base.util.MultiClassLoader - Not a > system class. > 19:43:53.297 [main] DEBUG o.a.s4.base.util.MultiClassLoader - > MultiClassLoader loadClass - className: org.apache.s4.core.App, > resolveIt: true > 19:43:53.298 [main] DEBUG o.a.s4.base.util.MultiClassLoader - > Returning system class (in CLASSPATH). > 19:43:53.298 [main] DEBUG o.a.s4.base.util.MultiClassLoader - > Returning newly loaded class. > 19:43:53.298 [main] DEBUG o.a.s4.base.util.MultiClassLoader - > MultiClassLoader loadClass - className: org.apache.s4.core.KeyFinder, > resolveIt: true > 19:43:53.298 [main] DEBUG o.a.s4.base.util.MultiClassLoader - > Returning system class (in CLASSPATH). > 19:43:53.299 [main] DEBUG o.a.s4.base.util.MultiClassLoader - > MultiClassLoader loadClass - className: java.lang.Throwable, > resolveIt: true > 19:43:53.299 [main] DEBUG o.a.s4.base.util.MultiClassLoader - > Returning system class (in CLASSPATH). > 19:43:53.299 [main] DEBUG o.a.s4.base.util.MultiClassLoader - > MultiClassLoader loadClass - className: > java.lang.InterruptedException, resolveIt: true > 19:43:53.299 [main] DEBUG o.a.s4.base.util.MultiClassLoader - > Returning system class (in CLASSPATH). > 19:43:53.303 [main] INFO org.apache.s4.comm.topology.Cluster - Added > cluster node: localhost:5077 > 19:43:53.336 [main] INFO o.a.s.c.topology.AssignmentFromFile - Host > Name: 10.0.1.97 > 19:43:53.336 [main] INFO o.a.s.c.topology.AssignmentFromFile - > Partition available: true > 19:43:53.352 [main] INFO o.a.s.c.topology.AssignmentFromFile - > Partition acquired by PID:16610 HOST:Leos-MacBook-Air.local Lock File > location: /tmp/s4-0.lock > 19:43:53.352 [main] INFO o.a.s.c.topology.AssignmentFromFile - > Acquire partition:success. > 19:43:53.354 [main] DEBUG o.a.s4.base.util.MultiClassLoader - > MultiClassLoader loadClass - className: > org.apache.s4.example.counter.PrintPE, resolveIt: true > 19:43:53.355 [main] DEBUG o.a.s4.base.util.MultiClassLoader - Not a > system class. > 19:43:53.355 [main] DEBUG o.a.s4.base.util.MultiClassLoader - > MultiClassLoader loadClass - className: > org.apache.s4.core.ProcessingElement, resolveIt: true > 19:43:53.356 [main] DEBUG o.a.s4.base.util.MultiClassLoader - > Returning system class (in CLASSPATH). > 19:43:53.356 [main] DEBUG o.a.s4.base.util.MultiClassLoader - > Returning newly loaded class. > 19:43:53.359 [main] DEBUG o.a.s4.base.util.MultiClassLoader - > MultiClassLoader loadClass - className: java.lang.Object, resolveIt: > true > 19:43:53.359 [main] DEBUG o.a.s4.base.util.MultiClassLoader - > Returning system class (in CLASSPATH). > 19:43:53.360 [main] DEBUG o.a.s4.base.util.MultiClassLoader - > MultiClassLoader loadClass - className: org.apache.s4.base.Event, > resolveIt: true > 19:43:53.360 [main] DEBUG o.a.s4.base.util.MultiClassLoader - > Returning system class (in CLASSPATH). > 19:43:53.401 [main] DEBUG o.a.s4.base.util.MultiClassLoader - > MultiClassLoader loadClass - className: > org.apache.s4.example.counter.CountKeyFinder, resolveIt: true > 19:43:53.401 [main] DEBUG o.a.s4.base.util.MultiClassLoader - Not a > system class. > 19:43:53.402 [main] DEBUG o.a.s4.base.util.MultiClassLoader - > Returning newly loaded class. > 19:43:53.402 [main] DEBUG o.a.s4.base.util.MultiClassLoader - > MultiClassLoader loadClass - className: java.util.List, resolveIt: > true > 19:43:53.402 [main] DEBUG o.a.s4.base.util.MultiClassLoader - > Returning system class (in CLASSPATH). > 19:43:53.404 [main] DEBUG o.a.s4.base.util.MultiClassLoader - > MultiClassLoader loadClass - className: > org.apache.s4.example.counter.CounterPE, resolveIt: true > 19:43:53.404 [main] DEBUG o.a.s4.base.util.MultiClassLoader - Not a > system class. > 19:43:53.404 [main] DEBUG o.a.s4.base.util.MultiClassLoader - > Returning newly loaded class. > 19:43:53.404 [main] DEBUG o.a.s4.base.util.MultiClassLoader - > MultiClassLoader loadClass - className: > org.apache.s4.example.counter.CountEvent, resolveIt: true > 19:43:53.405 [main] DEBUG o.a.s4.base.util.MultiClassLoader - Not a > system class. > 19:43:53.405 [main] DEBUG o.a.s4.base.util.MultiClassLoader - > Returning newly loaded class. > 19:43:53.405 [main] DEBUG o.a.s4.base.util.MultiClassLoader - > MultiClassLoader loadClass - className: org.apache.s4.core.Stream, > resolveIt: true > 19:43:53.405 [main] DEBUG o.a.s4.base.util.MultiClassLoader - > Returning system class (in CLASSPATH). > 19:43:53.407 [main] DEBUG o.a.s4.base.util.MultiClassLoader - > MultiClassLoader loadClass - className: java.util.concurrent.TimeUnit, > resolveIt: true > 19:43:53.408 [main] DEBUG o.a.s4.base.util.MultiClassLoader - > Returning system class (in CLASSPATH). > 19:43:53.413 [main] DEBUG o.a.s4.base.util.MultiClassLoader - > MultiClassLoader loadClass - className: > org.apache.s4.example.counter.UserIDKeyFinder, resolveIt: true > 19:43:53.414 [main] DEBUG o.a.s4.base.util.MultiClassLoader - Not a > system class. > 19:43:53.414 [main] DEBUG o.a.s4.base.util.MultiClassLoader - > Returning newly loaded class. > 19:43:53.414 [main] DEBUG o.a.s4.base.util.MultiClassLoader - > MultiClassLoader loadClass - className: > org.apache.s4.example.counter.GenderKeyFinder, resolveIt: true > 19:43:53.415 [main] DEBUG o.a.s4.base.util.MultiClassLoader - Not a > system class. > 19:43:53.415 [main] DEBUG o.a.s4.base.util.MultiClassLoader - > Returning newly loaded class. > 19:43:53.415 [main] DEBUG o.a.s4.base.util.MultiClassLoader - > MultiClassLoader loadClass - className: > org.apache.s4.example.counter.AgeKeyFinder, resolveIt: true > 19:43:53.416 [main] DEBUG o.a.s4.base.util.MultiClassLoader - Not a > system class. > 19:43:53.416 [main] DEBUG o.a.s4.base.util.MultiClassLoader - > Returning newly loaded class. > 19:43:53.416 [main] DEBUG o.a.s4.base.util.MultiClassLoader - > MultiClassLoader loadClass - className: > org.apache.s4.example.counter.GenerateUserEventPE, resolveIt: true > 19:43:53.417 [main] DEBUG o.a.s4.base.util.MultiClassLoader - Not a > system class. > 19:43:53.417 [main] DEBUG o.a.s4.base.util.MultiClassLoader - > MultiClassLoader loadClass - className: > org.apache.s4.core.SingletonPE, resolveIt: true > 19:43:53.417 [main] DEBUG o.a.s4.base.util.MultiClassLoader - > Returning system class (in CLASSPATH). > 19:43:53.418 [main] DEBUG o.a.s4.base.util.MultiClassLoader - > Returning newly loaded class. > 19:43:53.418 [main] DEBUG o.a.s4.base.util.MultiClassLoader - > MultiClassLoader loadClass - className: > org.apache.s4.example.counter.UserEvent, resolveIt: true > 19:43:53.418 [main] DEBUG o.a.s4.base.util.MultiClassLoader - Not a > system class. > 19:43:53.418 [main] DEBUG o.a.s4.base.util.MultiClassLoader - > Returning newly loaded class. > 19:43:53.418 [main] DEBUG o.a.s4.base.util.MultiClassLoader - > MultiClassLoader loadClass - className: java.lang.String, resolveIt: > true > 19:43:53.418 [main] DEBUG o.a.s4.base.util.MultiClassLoader - > Returning system class (in CLASSPATH). > 19:43:53.420 [main] DEBUG o.a.s4.base.util.MultiClassLoader - > MultiClassLoader loadClass - className: java.util.Random, resolveIt: > true > 19:43:53.420 [main] DEBUG o.a.s4.base.util.MultiClassLoader - > Returning system class (in CLASSPATH). > 19:43:53.420 [main] DEBUG o.a.s4.base.util.MultiClassLoader - > MultiClassLoader loadClass - className: java.util.ArrayList, > resolveIt: true > 19:43:53.420 [main] DEBUG o.a.s4.base.util.MultiClassLoader - > Returning system class (in CLASSPATH). > 19:43:53.420 [main] DEBUG o.a.s4.base.util.MultiClassLoader - > MultiClassLoader loadClass - className: java.lang.Character, > resolveIt: true > 19:43:53.420 [main] DEBUG o.a.s4.base.util.MultiClassLoader - > Returning system class (in CLASSPATH). > 19:43:53.421 [main] DEBUG o.a.s4.base.util.MultiClassLoader - > MultiClassLoader loadClass - className: java.lang.Integer, resolveIt: > true > 19:43:53.421 [main] DEBUG o.a.s4.base.util.MultiClassLoader - > Returning system class (in CLASSPATH). > 19:43:53.423 [User Stream] TRACE org.apache.s4.core.ProcessingElement > - OnCreateInternal > 19:43:53.423 [Gender Stream] TRACE > org.apache.s4.core.ProcessingElement - OnCreateInternal > 19:43:53.423 [Age Stream] TRACE org.apache.s4.core.ProcessingElement - > OnCreateInternal > 19:43:53.428 [main] DEBUG o.a.s4.base.util.MultiClassLoader - > MultiClassLoader loadClass - className: java.lang.Thread, resolveIt: > true > 19:43:53.428 [main] DEBUG o.a.s4.base.util.MultiClassLoader - > Returning system class (in CLASSPATH). > 19:43:53.430 [Gender Stream] TRACE > org.apache.s4.core.ProcessingElement - Num PE instances: 0. > 19:43:53.430 [User Stream] TRACE org.apache.s4.core.ProcessingElement > - Num PE instances: 0. > 19:43:53.430 [Age Stream] TRACE org.apache.s4.core.ProcessingElement - > Num PE instances: 0. > Exception in thread "Age Stream" java.lang.NoClassDefFoundError: > org/apache/s4/example/counter/CounterPE > at OverloadDispatcher847.dispatchEvent(Unknown Source) > at > org.apache.s4.core.ProcessingElement.handleInputEvent(ProcessingElement.java:376) > at org.apache.s4.core.Stream.run(Stream.java:272) > at java.lang.Thread.run(Thread.java:680) > Caused by: java.lang.ClassNotFoundException: > org.apache.s4.example.counter.CounterPE > at java.net.URLClassLoader$1.run(URLClassLoader.java:202) > at java.security.AccessController.doPrivileged(Native Method) > at java.net.URLClassLoader.findClass(URLClassLoader.java:190) > at java.lang.ClassLoader.loadClass(ClassLoader.java:306) > at java.lang.ClassLoader.loadClass(ClassLoader.java:247) > ... 4 more > Exception in thread "Gender Stream" java.lang.NoClassDefFoundError: > org/apache/s4/example/counter/CounterPE > at OverloadDispatcher3022.dispatchEvent(Unknown Source) > at > org.apache.s4.core.ProcessingElement.handleInputEvent(ProcessingElement.java:376) > at org.apache.s4.core.Stream.run(Stream.java:272) > at java.lang.Thread.run(Thread.java:680) > Caused by: java.lang.ClassNotFoundException: > org.apache.s4.example.counter.CounterPE > at java.net.URLClassLoader$1.run(URLClassLoader.java:202) > at java.security.AccessController.doPrivileged(Native Method) > at java.net.URLClassLoader.findClass(URLClassLoader.java:190) > at java.lang.ClassLoader.loadClass(ClassLoader.java:306) > at java.lang.ClassLoader.loadClass(ClassLoader.java:247) > ... 4 more > Exception in thread "User Stream" java.lang.NoClassDefFoundError: > org/apache/s4/example/counter/CounterPE > at OverloadDispatcher2958.dispatchEvent(Unknown Source) > at > org.apache.s4.core.ProcessingElement.handleInputEvent(ProcessingElement.java:376) > at org.apache.s4.core.Stream.run(Stream.java:272) > at java.lang.Thread.run(Thread.java:680) > Caused by: java.lang.ClassNotFoundException: > org.apache.s4.example.counter.CounterPE > at java.net.URLClassLoader$1.run(URLClassLoader.java:202) > at java.security.AccessController.doPrivileged(Native Method) > at java.net.URLClassLoader.findClass(URLClassLoader.java:190) > at java.lang.ClassLoader.loadClass(ClassLoader.java:306) > at java.lang.ClassLoader.loadClass(ClassLoader.java:247) > ... 4 more > 19:43:58.429 [main] DEBUG o.a.s4.base.util.MultiClassLoader - > MultiClassLoader loadClass - className: java.lang.System, resolveIt: > true > 19:43:58.429 [main] DEBUG o.a.s4.base.util.MultiClassLoader - > Returning system class (in CLASSPATH). > 19:43:58.429 [main] DEBUG o.a.s4.base.util.MultiClassLoader - > MultiClassLoader loadClass - className: java.io.PrintStream, > resolveIt: true > 19:43:58.429 [main] DEBUG o.a.s4.base.util.MultiClassLoader - > Returning system class (in CLASSPATH). > Done. Closing... > Bye. > 19:43:58.430 [Age Count Stream] INFO org.apache.s4.core.Stream - > Closing stream Age Count Stream. > 19:43:58.430 [Gender Count Stream] INFO org.apache.s4.core.Stream - > Closing stream Gender Count Stream. > 19:43:58.430 [User Count Stream] INFO org.apache.s4.core.Stream - > Closing stream User Count Stream. > > > > On Tue, Oct 18, 2011 at 11:00 PM, Leo Neumeyer <[email protected]> > wrote: > > Matthieu, please check my *modules* branch. > > I packaged the counter example in a *.s4r file (a jar with a different > > extension name). Here is how: > > https://github.com/leoneu/s4-piper/blob/modules/NOTES.md > > I fixed the code so we can read the jar as a resource from the classpath. > > The HelloApp example works fine but there is an exception when trying to > > load the counter app. The MyApp class should load as is, I think. You > will > > probably find the bug by the time I wake up :-) The good side of being 9 > > time zones apart. > > -leo > > > > > > -- > > -leo >
