java - Using Ghost4j with MaxProcessCount on a tomcat causes jna error -

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i'm trying develop web-service (based on jersey) converting pdf document jpeg images. choosed ghostscript because have experiences , it's results (especially embedet fonts). searched way use ghostscript java , found ghost4j.

so put ghost4j jars applications lib folder (also jna.jar). in first tests encountered problem executing task more once, because jna throws error when it's launched more 1 time. put jna.jar tomcat lib folder. worked littlebit better, executed 1 task @ time. if started 1 @ same time, nothing happened. didn't seem execute other task.

so tried setmaxprocesscount(2); allow application execute more 1 task @ time. here code:

private static void generateimages(string inputfile, string outputpath) throws ioexception, rendererexception, org.ghost4j.document.documentexception {         pdfdocument document = new pdfdocument();         document.load(new file(inputfile));         simplerenderer renderer = new simplerenderer();         renderer.setmaxprocesscount(2);         renderer.setresolution(150);         renderer.setantialiasing(4);         system.setproperty("jna.library.path", "c:\\program files\\gs\\gs9.09\\bin\\");         list<image> images = renderer.render(document);         (int = 0; < images.size(); i++) {                 imageio.write((renderedimage) images.get(i), "jpeg", new file(outputpath + file.separatorchar + (i + 1) + ".jpeg"));         } }

but if i'm trying execute task, ghost4j throws error:

org.ghost4j.renderer.rendererexception: java.lang.exception: java.lang.noclassdeffounderror: com/sun/jna/structure     @ org.ghost4j.renderer.abstractremoterenderer.render(abstractremoterenderer.java:133)     @ pdfresource.conversiontask.generateimages(conversiontask.java:218)     @ pdfresource.conversiontask.exec(conversiontask.java:58)     @ pdfresource.task.run(task.java:86)     @ java.lang.thread.run(thread.java:724) caused by: java.lang.exception: java.lang.noclassdeffounderror: com/sun/jna/structure     @ gnu.cajo.invoke.remote.invoke(remote.java:594)     @ gnu.cajo.invoke.remote.invoke(remote.java:722)     @ sun.reflect.nativemethodaccessorimpl.invoke0(native method)     @ sun.reflect.nativemethodaccessorimpl.invoke(nativemethodaccessorimpl.java:57)     @ sun.reflect.delegatingmethodaccessorimpl.invoke(delegatingmethodaccessorimpl.java:43)     @ java.lang.reflect.method.invoke(method.java:606)     @ sun.rmi.server.unicastserverref.dispatch(unicastserverref.java:322)     @ sun.rmi.transport.transport$1.run(transport.java:177)     @ sun.rmi.transport.transport$1.run(transport.java:174)     @ java.security.accesscontroller.doprivileged(native method)     @ sun.rmi.transport.transport.servicecall(transport.java:173)     @ sun.rmi.transport.tcp.tcptransport.handlemessages(tcptransport.java:553)     @ sun.rmi.transport.tcp.tcptransport$connectionhandler.run0(tcptransport.java:808)     @ sun.rmi.transport.tcp.tcptransport$connectionhandler.run(tcptransport.java:667)     @ java.util.concurrent.threadpoolexecutor.runworker(threadpoolexecutor.java:1145)     @ java.util.concurrent.threadpoolexecutor$worker.run(threadpoolexecutor.java:615)     @ java.lang.thread.run(thread.java:724)     @ sun.rmi.transport.streamremotecall.exceptionreceivedfromserver(streamremotecall.java:273)     @ sun.rmi.transport.streamremotecall.executecall(streamremotecall.java:251)     @ sun.rmi.server.unicastref.invoke(unicastref.java:160)     @ java.rmi.server.remoteobjectinvocationhandler.invokeremotemethod(remoteobjectinvocationhandler.java:194)     @ java.rmi.server.remoteobjectinvocationhandler.invoke(remoteobjectinvocationhandler.java:148)     @ com.sun.proxy.$proxy165.invoke(unknown source)     @ gnu.cajo.invoke.remote.invoke(remote.java:565)     @ org.ghost4j.renderer.abstractremoterenderer.render(abstractremoterenderer.java:126)     ... 4 more caused by: java.lang.noclassdeffounderror: com/sun/jna/structure     @ org.ghost4j.renderer.simplerenderer.run(simplerenderer.java:68)     @ org.ghost4j.renderer.abstractremoterenderer.remoterender(abstractremoterenderer.java:64)     @ sun.reflect.nativemethodaccessorimpl.invoke0(native method)     @ sun.reflect.nativemethodaccessorimpl.invoke(nativemethodaccessorimpl.java:57)     @ sun.reflect.delegatingmethodaccessorimpl.invoke(delegatingmethodaccessorimpl.java:43)     @ java.lang.reflect.method.invoke(method.java:606)     @ gnu.cajo.invoke.remote.invoke(remote.java:582)     @ gnu.cajo.invoke.remote.invoke(remote.java:722)     @ sun.reflect.nativemethodaccessorimpl.invoke0(native method)     @ sun.reflect.nativemethodaccessorimpl.invoke(nativemethodaccessorimpl.java:57)     @ sun.reflect.delegatingmethodaccessorimpl.invoke(delegatingmethodaccessorimpl.java:43)     @ java.lang.reflect.method.invoke(method.java:606)     @ sun.rmi.server.unicastserverref.dispatch(unicastserverref.java:322)     @ sun.rmi.transport.transport$1.run(transport.java:177)     @ sun.rmi.transport.transport$1.run(transport.java:174)     @ java.security.accesscontroller.doprivileged(native method)     @ sun.rmi.transport.transport.servicecall(transport.java:173)     @ sun.rmi.transport.tcp.tcptransport.handlemessages(tcptransport.java:553)     @ sun.rmi.transport.tcp.tcptransport$connectionhandler.run0(tcptransport.java:808)     @ sun.rmi.transport.tcp.tcptransport$connectionhandler.run(tcptransport.java:667)     @ java.util.concurrent.threadpoolexecutor.runworker(threadpoolexecutor.java:1145)     @ java.util.concurrent.threadpoolexecutor$worker.run(threadpoolexecutor.java:615)     ... 1 more caused by: java.lang.classnotfoundexception: com.sun.jna.structure     @ java.net.urlclassloader$1.run(urlclassloader.java:366)     @ java.net.urlclassloader$1.run(urlclassloader.java:355)     @ java.security.accesscontroller.doprivileged(native method)     @ java.net.urlclassloader.findclass(urlclassloader.java:354)     @ java.lang.classloader.loadclass(classloader.java:424)     @ sun.misc.launcher$appclassloader.loadclass(launcher.java:308)     @ java.lang.classloader.loadclass(classloader.java:357)     ... 23 more

i guess has todo additional jvm ghost4j launching , doesn't seem use same classpath tomcat uses, i'm not java expert , have no idea how solve problem.


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