Converting from java.util.Date to XMLGregorianCalendar

If you need to convert from java.util.date to an XMLGregorianCalendar format you can use the following code:

import javax.xml.datatype.DatatypeFactory;
import javax.xml.datatype.XMLGregorianCalendar;
import javax.xml.datatype.DatatypeConfigurationException;
import java.util.GregorianCalendar;

public class DateConversion {
   public XMLGregorianCalendar dateToXMLGregorianCalendar(
   final java.util.Date date)
   throws DatatypeConfigurationException {
      DatatypeFactory df = DatatypeFactory.newInstance();
      if (date == null) {
         return null;
      } else {
         GregorianCalendar gc = new GregorianCalendar();
         gc.setTimeInMillis(date.getTime());
         return df.newXMLGregorianCalendar(gc);
      }
   }
}

Touch all files within the current directory

If you need to update all files within the current directory with the latest timestamp you can use the following command:
find . -type f -exec touch {} \;

Unmarshal an object using JAXB

The code below can be used to Unmarshal XML that comes in as a String value to an Object (Assuming that JAXB was used to create your classes from the Schema).

String theXMLString = " ... your XML saved as a String value ... ";
MyObject myObject = null;
try {
     //"mypackage" is the package where JAXB created the schema classes
    final JAXBContext jaxbContext = JAXBContext.newInstance("mypackage");
    final Unmarshaller unmarshaller = jaxbContext.createUnmarshaller();
    final ByteArrayInputStream byteStream = new        ByteArrayInputStream(theXMLString.getBytes());
    myObject = (MyObject) unmarshaller.unmarshal(byteStream);
} catch (JAXBException e) {
    System.out.println("An error has occurred: "+e.getMessage(), e);
}

"No runnable methods" error when doing a Maven install

When doing a maven install I kept getting a Build Failed with this error being generated when attempting to run the test cases:


java.lang.Exception: No runnable methods at
org.junit.internal.runners.TestClassMethodsRunner.testAborted


To solve this problem I first ran a maven clean:

$ mvn clean

and then ran the maven install

$ mvn install

Starting up HSQLDB

java -classpath [lib_path]/hsqldb.jar org.hsqldb.Server

Ctrl-C to kill the the Session

Changing your windows drive on the command prompt

To change your drive from say C:/ to D:/ just do the following:

C:/>d:
D:/>

So all that is required is for you to type in "d:" and press Enter.

Oracle escaping the single quote(') in a select

This query will fail when doing a select statement:

select * from table_name where field='it's friday today';



To escape the single quote (') you need to add in another single quote (''):

select * from table_name where field='it''s friday today';