Servlet that talks to Serial Port

Everyone,
I am having trouble getting a servlet to talk to a serial port. I am using the Comms extension package from Sun. The servlet fails to initialize and I cannot figure out if it is a security issue or a class loader issue. If it is a security issue can someone tell me a quit and dirty way to turn security off. At this stage, I have control of both client and server and I am not concerned with security. I am using the Sun System Java Application Server 8 to deploy the servlet. Below is the trace
Allocate exception for servlet ModemServletjavax.servlet.ServletException: javax/comm/SerialPortEventListener at org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:286) at org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:162) at org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:115) at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:997) at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:670) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:150) at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:109) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:522) at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:214) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:168) at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:109) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:522) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:144) at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:109) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:133) at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:107) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:539) at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:107) at com.sun.enterprise.webservice.EjbWebServiceValve.invoke(EjbWebServiceValve.java:134) at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:107) at com.sun.enterprise.security.web.SingleSignOn.invoke(SingleSignOn.java:254) at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:107) at com.sun.enterprise.web.VirtualServerValve.invoke(VirtualServerValve.java:209) at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:107) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:522) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:114) at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:109) at com.sun.enterprise.web.VirtualServerMappingValve.invoke(VirtualServerMappingValve.java:166) at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:107) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:522) at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:936) at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:165) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:683) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:604) at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:542) at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:647) at java.lang.Thread.run(Thread.java:534)----- Root Cause -----java.lang.NoClassDefFoundError: javax/comm/SerialPortEventListener at java.lang.ClassLoader.defineClass0(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:537) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123) at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1732) at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:904) at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1370) at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1233) at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302) at ModemServlet.init(ModemServlet.java:21) at javax.servlet.GenericServlet.init(GenericServlet.java:261) at sun.reflect.GeneratedMethodAccessor169.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:324) at org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:246) at java.security.AccessController.doPrivileged(Native Method) at javax.security.auth.Subject.doAsPrivileged(Subject.java:500) at org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:268) at org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:162) at org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:115) at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:997) at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:670) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:150) at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:109) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:522) at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:214) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:168) at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:109) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:522) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:144) at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:109) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:133) at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:107) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:539) at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:107) at com.sun.enterprise.webservice.EjbWebServiceValve.invoke(EjbWebServiceValve.java:134) at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:107) at com.sun.enterprise.security.web.SingleSignOn.invoke(SingleSignOn.java:254) at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:107) at com.sun.enterprise.web.VirtualServerValve.invoke(VirtualServerValve.java:209) at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:107) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:522) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:114) at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:109) at com.sun.enterprise.web.VirtualServerMappingValve.invoke(VirtualServerMappingValve.java:166) at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:107) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:522) at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:936) at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:165) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:683) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:604) at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:542) at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:647) at java.lang.Thread.run(Thread.java:534)

You could try and open up the permissions on the appserver and see if the error goes away as a test. You can do this by editing the domains/domain1/config/server.policy, saving the file and restarting the app server.

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However, CommPortIdentifier.getPortIdentifiers() returns null. I've used the same code standalone with no problems.
Is the security model getting in the way and do I need to disable or configure the security to allow access from a servlet to the serial ports? Perhaps a parameter within web.xml is required? Maybe an act of God?
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DrClap,
Thanks for the advice. After some trial and error, I got it working. I came to the following conclusions via some experimentation.
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Atn. Ing. Jorge Cardozo. San Luis Rassini Corporation. Piedras Negras Coahuila Mexico.
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Attachments:
KA-COUNTER (Comparacion).vi ‏77 KB

hi there
to collect scalar data in an array you can use a so called "Shift register". To display the history of scalar data you can use a Waveform Chart (not a "Graph", a "Chart"). See attachments. because i can't save the vi as 5.1 i appended some screenshots of the front panel and the block diagramm.
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Attachments:
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Servlet using Serial Port

Everyone,
I am having trouble getting a servlet to access a serial port. I am deploying to Sun Application Server 8. I am using the Sun Java Communications API for the serial communications. When I downloaded the Comms API, the readme described three steps to integrate the API into the Java environment.
1.) Copy these files into the bin directory of the JRE
win21com.dll
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# Drivers loaded by the Java Communications API standard extension
# at initialization time
# Format:
# Each line must contain ONE driver definition only
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HI,
DaleWA wrote:
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Yes, there is third party support for linux and MacOS-X. It's released under GPL and can be found here -> http://www.rxtx.org/

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I have used the serial ports in LV 6.1 without trouble.
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I am not very familiar with this area but I am 99% sure you wouldn't get a signal to tell you are printer had been plugged in to a serial port.
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Hi,
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Many forum posts about installation to java 1.4. Also see:
http://forum.java.sun.com/thread.jspa?forumID=31&threadID=453195
and
http://forum.java.sun.com/thread.jspa?forumID=31&threadID=444673
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