Lemonpress’s Weblog

There are odd dependencies between tag handlers and POJOs (or Java Beans) that are used by tag handlers:

if the POJO/JavaBean already exists as a compiles .class file and we created a new tag handler that uses it

The tag handler won’t compile!

Solution:

• delete dependent .class files in the file browser
• deselect “build a”
• recompile the project (in Eclipse choose Project -> Build Project)

And in the future make sure that
you turned off “Build Automatically”

see http://neptune.netcomp.monash.edu.au/JavaHelp/howto/jar.htm

create compressed library archive (JAR)

jar   cf   archive_name.jar   list-of-files

jar   cf   example.jar   One.java   Two.java   Three.java

jar   cf   example.jar   *.java

jar   cf   example.jar    *

create java executable

javac  * java     compile all Java source files in the current dir

javac   One.java  Two.java  Three.java

create an executable JAR

• create a text file that lists the “main” class e.g. mainClass.txt Main-Class: Three
• jar  cmf   mainClass.txt   example.jar   *.class

c -    with modifications to the manifest file
m-   name jar after main class as specified within mainClass.txt
f -    including everything that matches the pattern *class

run executable JAR from command line

java   -jar   example.jar

Options

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xxx.jar - a library of useful classes packaged in a single archive file.

using libraries in your project is dead-easy.

1. create classes, e.g. a collection of custom tag handlers
2. zip them up using jar cf mytags.jar *
   or jar cf mytags.jar list-of-files.class
3. copy mytags.jar into lib/ dir of another project (see More)
4. use them

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