jboss - How to inject a logging statement before every catch block in java -


i started aspect oriented programming using jboss , , have implemented code injection - before , after method gets called , after method throws exception. want know how inject code within method ? want inject logging statement before every catch block gets executed , how using java ?

i not know jboss aop, in case can use aspectj because features handler() pointcut.

driver application:

package de.scrum_master.app;  import java.io.filenotfoundexception; import java.io.ioexception; import java.util.random; import java.util.concurrent.timeoutexception;  import javax.naming.namingexception;  public class application {     public static void throwrandomexception() throws timeoutexception, ioexception, namingexception {         switch (new random().nextint(5)) {             case 0: throw new timeoutexception("too late, baby");             case 1: throw new filenotfoundexception("file.txt");             case 2: throw new ioexception("no read permission");             case 3: throw new nullpointerexception("cannot call method on non-existent object");             case 4: throw new namingexception("unknown name");         }     }      public static void main(string[] args) {         (int = 0; < 10; i++) {             try { throwrandomexception(); }             catch (nullpointerexception e) {}             catch (filenotfoundexception e) {}             catch (timeoutexception e) {}             catch (ioexception e) {}             catch (namingexception e) {}         }     } }

aspect:

package de.scrum_master.aspect;  import org.aspectj.lang.joinpoint; import org.aspectj.lang.annotation.aspect; import org.aspectj.lang.annotation.before;  @aspect public class caughtexceptionlogger {     @before("handler(*) && args(e)")     public void logcaughtexception(joinpoint thisjoinpoint, exception e) {         system.out.println(thisjoinpoint + " -> " + e.getmessage());     } }

console output:

handler(catch(timeoutexception)) -> late, baby handler(catch(filenotfoundexception)) -> file.txt handler(catch(namingexception)) -> unknown name handler(catch(timeoutexception)) -> late, baby handler(catch(namingexception)) -> unknown name handler(catch(namingexception)) -> unknown name handler(catch(nullpointerexception)) -> cannot call method on non-existent object handler(catch(filenotfoundexception)) -> file.txt handler(catch(filenotfoundexception)) -> file.txt handler(catch(nullpointerexception)) -> cannot call method on non-existent object

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