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Home/ Questions/Q 655453
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Editorial Team
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Editorial Team
Asked: May 13, 20262026-05-13T22:36:19+00:00 2026-05-13T22:36:19+00:00

I have the below method which is meant to append information to a file

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I have the below method which is meant to append information to a file but I get the error below. In the method I use parts of robocode API which inherits from java.io.InputStream

All the permissions on the files and folders seem fine and the file does exist

static public void logInfo(String info) 
{        

    RobocodeFileWriter in;
    try {
        in = new RobocodeFileWriter("log.txt");
        in.append(info);
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }       


}

SYSTEM: An error occurred during initialization of itc.solomon
SYSTEM: java.security.AccessControlException: Preventing itc.solomon from access: (java.io.FilePermission log.txt read): You may only read files in your own root package directory.
java.security.AccessControlException: Preventing itc.solomon from access: (java.io.FilePermission log.txt read): You may only read files in your own root package directory.
at robocode.security.RobocodeSecurityManager.handleSecurityProblem(Unknown Source)
at robocode.security.RobocodeSecurityManager.checkPermission(Unknown Source)
at java.lang.SecurityManager.checkRead(SecurityManager.java:888)
at java.io.File.exists(File.java:748)
at robocode.RobocodeFileOutputStream.(Unknown Source)
at robocode.RobocodeFileOutputStream.(Unknown Source)
at robocode.RobocodeFileWriter.(Unknown Source)
at itc.CFile.logInfo(CFile.java:16)
at itc.solomon.(solomon.java:43)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:532)
at java.lang.Class.newInstance0(Class.java:372)
at java.lang.Class.newInstance(Class.java:325)
at robocode.peer.proxies.HostingRobotProxy.loadRobotRound(Unknown Source)
at robocode.peer.proxies.HostingRobotProxy.run(Unknown Source)
at java.lang.Thread.run(Thread.java:636)

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  1. Editorial Team
    Editorial Team
    2026-05-13T22:36:19+00:00Added an answer on May 13, 2026 at 10:36 pm

    See this sample:
    http://code.google.com/p/robocode/source/browse/robocode/trunk/robocode.samples/src/main/java/sample/SittingDuck.java

    I think getDataFile("log.txt") will give you proper location.

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