摘要: Unable to locate the Javac Compiler in:
C:\Program Files\Java\jre6\..\lib\tools.jar
Please ensure you are using JDK 1.4 or above and
not a JRE (the com.sun.tools.javac.Main class is required).
In most cases you can change the location of your Java
installation by setting the JAVA_HOME environment variable. 閱讀全文
摘要: It never fails to surprise me that so many developers are unaware that SimpleDateFormat is not thread-safe. It seems like almost all J2EE projects I work on have code that uses instance variables or static instance variables to store a SimpleDateFormat that is then used throughout the code base without any concurrency control. 閱讀全文