system properties which control automatic output of call and exception logs in Java

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system properties which control automatic output of call and exception logs
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Even if you don't use these facilities for application logging, they are still very useful for debugging purposes 1832 Debug logging RMI contains extensive provision for logging of incoming remote calls and exceptions in servers, as well as a large number of internal actions This logging is provided for debugging purposes It is controlled by the settings of the system properties shown in Table B1 and Table B2 You will probably only want to use the logging provided by javarmiserverlogCalls[5]
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or perhaps only sunrmiserverexceptionTrace, subject to the usual warning about using Sun implementation dependent features Notes on the logging built in to RMI:
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1 You can use these settings to observe the internal actions and exceptions in the RMI registry and rmid 2 The output of javarmiserverlogCalls includes calls to the DGC subsystem 3 These property settings control logging behaviour in "unicast" and activatable servers, but not in RMI/IIOP servers For dual protocol JRMP+IIOP servers, the property settings only control logging when invoked via a JRMP stub (ie via the JRMP dispatcher at the server)
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184 Debugging
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RMI clients can be debugged using standard Java debugging systems Debugging RMI servers is more complicated You can run your RMI servers under a standard Java debugging system; however, if you set breakpoints inside remote methods, you may cause the client of the call to timeout while you are diagnosing your server's behaviour, if a client timeout is in effect It would be nice to have an integrated client server RMI debugging system At the present time no such system is available from Sun; other vendors may have products available In the absence of such a product, you may use one or more of the following techniques to debug RMI servers:
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Run the server as a local object in the client JVM, ie bypass RMI altogether, and use a standard debugging product on the client JVM This will help you diagnose application logic, but it won't help with problems which only manifest themselves under RMI Set javarmiserverlogCalls to "true", and redirect Systemerr to a log file "Instrument" your RMI server with execution traces, and cause these to be saved to a log file Set one or more of the many sunrmi* RMI logging properties to BRIEF or VERBOSE, and cause these logs to be saved to a log file
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The easiest way to get the "sunrmi*" logs to be saved to a log file is to redirect Systemerr 1841 RMIstat utility Sun have made a debugging utility class available on a non supported basis[6] It is a class called RMIstat It provides a number of static methods to dump the internal state of the RMI runtime system:
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Share and enjoy, RMI Mailing List You will have to search the RMI Mailing List for this posting dated 12 May 2000, which contains the source code for the class
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dumpEndpoints dumpObjectTable dumpParams dumpThreads dumpTransports
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You can embed calls to these methods inside your RMI clients and servers In each case the purpose of the method is obvious from its name
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185 Testing RMI in a single machine
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1851 Loopback You can test and use RMI in a single machine which doesn't have a network adapter, if you can install a "loopback driver" This is a protocol driver which satisfies the TCP/IP protocol stack's requirement for a MAC (media access layer) driver without needing a physical piece of hardware, and lets the address 127001 work inside the box Microsoft Windows 95 doesn't have a loopback driver One way to get around this is to configure an unused COM port as a dedicated PPP or SLIP connection; disable DHCP, and manually configure an IP address, eg 19216811 You should then find that you can ping yourself from a DOS shell:
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