Java Talks

I was able to use SVN with ease (checkin, checkout, update code) until recently the SVN server went through some changes. I started to see the following on each SVN command: Error validating server certificate for 'https://svn.myserver.com:443':  - The certificate is not issued by a trusted authority. Use the    fingerprint to validate the certificate manually!  - The certificate hostname does not match. Certificate information:  - Hostname: de-v-svn  - Valid: from ...  - Issuer: I...  - Fingerprint: ... (R)eject, accept (t)emporarily or accept (p)ermanently? It worked fine when I selected  (p)ermanently but had to do it again next time I used  SVN command. Solution: Delete ~/.subversion folder. svn cleanup svn up

Do not use 'category'. In log4j 1.2, the Category class has marked as being deprecated and has been replaced by the Logger class. I am using log4j-1.2.14.jar and category didn't work for me. Example: <logger name="com.test.pkg1"><level value="INFO"/></logger> <logger name="com.test.pkg2"><level value="INFO"/></logger> Was: <category name="com.test.pkg1"><priority value="INFO"/></category> <category name="com.test.pkg2"><priority value="INFO"/></category>

When you are about to download Glassfish server 3.x, you need to decide you want to download Full Profile or Web Profile version. View the differences.

SVN client has a built-in system for caching authentication credentials on disk. It saves the credentials in the user's private runtime configuration area ~/.subversion/auth/ (Unix-like systems) %APPDATA%/Subversion/auth/ (Windows) If you dont want to catch the credeitials for a commit, use --no-auth-cache. $ svn commit --no-auth-cache Here we are telling the svn client that dont cach authentication credentials. You can disable credential caching permanently by editing your runtime config file (located next to the auth/ directory). Set store-auth-creds to no. [auth] store-auth-creds = no

Lists and Arrays of objects that implement Comparable interface can be sorted automatically by Collections.sort and Arrays.sort respectively. Implementation Comparable is easy. You just have to implement compareTo(Object o). It should return negative integer, zero, or a positive integer as this object is less than, equal to,or greater than the specified object. Here goes an example: public void testListSort(){ Calendar cal = Calendar.getInstance(); cal.set(2010, 10, 1); License msWindows7 = new License("Windows", "7",new Date(cal.getTimeInMillis())); cal.clear(); cal.set(2010, 11, 10); License msWindowsVista = new License("Windows", "Vista", new Date(cal.getTimeInMillis())); cal.clear(); cal.set(2010, 11, 5); License lotusNotes = new License("Notes", "1.1", new Date(cal.getTimeInMillis())); List list = new ArrayList (3); list.add(lotusNotes);

... double []test = new double []{88.6,88.9,-1,25,88.6}; int size = test.length; System.out.println("*** un-sorted ***"); for (double d : test){ System.out.println(d); } // descending sort algo ************************************* int counter = 0; int indexOfMax = 0; // after each iteration of while, test[counter] should have the correct value while (counter < size){ indexOfMax = counter; // assuming that test[counter] has the max value // this loop finds the index of max value (stores in indexOfMax) from the test array starting from index counter+1 for(int i = counter+1; i < size; i++){ if (test[i]>test[indexOfMax]){ indexOfMax = i; } } // end of for loop -- now indexOfMax should have the max value // swapping double tmp = test[counter]; test[cou