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Class-Path manifest entry pointing to MySQL JDBC library

Posted on 2003-12-09
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Last Modified: 2010-03-31
I am working on JDBC project.
If the library will be located under the relative path URL lib/mysql.jar in the directory where my code is run, how do I contain Class-Path manifest entry pointing to MySQL JDBC library? (I am trying to make jar file, so it can be run from any directory location .)
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Question by:dkim18
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Expert Comment

by:objects
ID: 9910263
Class-Path: lib/mysql.jar
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Author Comment

by:dkim18
ID: 9910449
Somehow the above didn't work.
I have tried this as well, but didn't work either.

Manifest-Version: 1.0
Main-Class: dkim18.jdbc.JDBCBook
Class-Path: lib/mysql.jar

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Expert Comment

by:girionis
ID: 9910486
 The path of the jar files should be relative to the jar file that contains the manifest. To make the above work make sure the jar file with the above manifest is located in the root folder of the lib/mysql.jar. For example if you have a folder structure like:

/home/myfolder/lib/mysql.jar your jar file should be in

/home/myfolder

in order to be able to load the lib/mysql.jar
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LVL 92

Expert Comment

by:objects
ID: 9910499
easiest would be to put them in same dir and use:

Class-Path: mysql.jar
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Author Comment

by:dkim18
ID: 9910642
This is my manifest file.

Manifest-Version: 1.0
Main-Class: dkim18.jdbc.JDBCBook
Class-Path: lib/mysql.jar

I created jar file by typing the following.
 jar -cvmf myManiFest dkim18_JDBC.jar dkim18/

and I excute jar file by typing the following.
java -jar dkim18_JDBC.jar

Now, I have this error msg.
java -jar dkim18_JDBC.jar
Exception in thread "main" java.lang.NullPointerException
        at java.io.Reader.<init>(Reader.java:61)
        at java.io.InputStreamReader.<init>(InputStreamReader.java:80)
        at java.util.Properties.load(Properties.java:189)
        at dkim18.jdbc.JDBCBook.createConnection(JDBCBook.java:37)
        at dkim18.jdbc.JDBCBook.<init>(JDBCBook.java:29)
        at dkim18.jdbc.JDBCBook.main(JDBCBook.java:97)

If I run my run.bat file, it works
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Assisted Solution

by:girionis
girionis earned 400 total points
ID: 9910670
 What is the line 37 of the JDBCBook java file? You are trying to use an object that is null.
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Accepted Solution

by:
objects earned 400 total points
ID: 9910696
looks like its not finding your properties file.
if you are using getResourceAsStream you should either include it in your jar, or include the directory in you Class-Path.
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LVL 92

Expert Comment

by:objects
ID: 9910705
alternatively load it from a known location such as users home directory.
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Expert Comment

by:Ovi
ID: 9911387
Check the way you are loading the resources. If there is used a file system path, this will not work inside a jar file.
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LVL 92

Expert Comment

by:objects
ID: 9915816
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