jmagick configuration

1. Go to http://downloads.jmagick.org/6.3.9/
2. Download ImageMagick-6.3.9-0-Q8-windows-dll.exe and jmagick-win-6.3.9-Q8.zip.
3. Install the exe file. This will install ImageMagick which is a prerequisite for JMagick to work.
4. Extract the zip file. This will give jmagick.dll and jmagick.jar
5. Copy the jmagick.jar to you lib folder and include it in the classpath
6. Copy the jmagick.dll to the root installation directory of ImageMagic and add it as an entry to the PATH environment variable

xmlbeans runtime error NoSuchMethodError

You might get this run time error when you have two copies of proj-xmlbeans.jar on your classpath, one of which is a old one. 

check your APP-INF directory. In my case, APP-INF is the culprit. It has the new generated xmlbeans version and the old one as well.

Weblogic start up problems

weblogic.security.service.SecurityServiceRuntimeException: [Security:090399]Security Services Unavailable

Was the weblogic admin password changed in boot.properties?
If yes, then rename boot.properties (/Servers/AdminServer/security) to something else and try to start the server now. You can check for the logs under DOMAIN_DIR/Severs/AdminServer/log

If it doesn't work, try to rename ldap directory (DOMAIN_HOME/Severs/AdminServer/data/ldap) and then try to start the server.

Timestamp problem with SQL Developer

SQL developer doesn't display timestamp for any query result.

Simple Fix:
In Oracle SQLDeveloper Go to: Tools >> Preferences >> Database > NLS Parameters and update your Date Format field to DD-MON-RR HH:MI:SS value

toArray() class cast exception

List<Record> recordsList = new ArrayList<Record>(2);

...

Record[] records = (Record[]) recordsList.toArray() ; //incorrect

Record[] records = (Record[]) recordsList.toArray(new Record[2]); //correct

Why Class cast exception ?

Recall that a Collection can contain objects of vastly different types. There's no 'general' rule that objects in a Collection must all be of the exact same type. So when toArray() is being calling, it allocates a typed array Object[] which has no sub-classes defined. Therefore casting it to any form such as (Record[]), will not work.

toArray() method can't see your cast so you have to tell it what kind of array to make.

create a folder structure outside of your application directory

private static final String UPLOAD_DIRECTORY = "uploads/img/"+now;

Date date = new Date() ;

SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy_MM_dd") ;

String now = dateFormat.format(date);

File uploadsFolder = new File(UPLOAD_DIRECTORY);

uploadsFolder.mkdirs();

File uploadedFile = new File(uploadsFolder, "fileName");

Replace Back slash with forward slash

String location = "uploads\img";

String backslash= System.getProperty(

location.replace(backslash,

or

location.replace("\\", "/");"/");"file.separator") ;