Error: Could not find or load main class during jar file execution in command prompt

Asked Apr 06 '16 at 12:36

Active Apr 06 '16 at 12:51

Viewed 638 times

I have written a java program in which I am creating a database connection using jdbc-odbc driver.

I have created manifest file which looks like :

Manifest-Version: 1.0
Main-Class: com.unisys.sql.CasePartitionExtractor
Class-Path: . rt.jar

rt.jar is used for database connectivity.

I ran following command to create jar:

jar -cvfm abc.jar manifest.txt \bin\com\unisys\sql\*.class \bin\com\unisys\connections\*.class

When I run the jar in command prompt, it's showing following error:

Error: Could not find or load main class com.unisys.sql.CasePartitionExtractor

Main Class is: CasePartitionExtractor.java
Databse connection class: ODBCConnection.java

Command used to run jar:

java -jar D:\Eclipse_OS2200\CaseSeparation\abc.jar

directory structure:

workspace->project_name->
                        bin/com/unisys/connections/ODBCConnection.class
                        bin/com/unisys/sql/CasePartitionExtractor.class
                        manifest.txt
                        rt.jar

I am not able to figure it out what is wrong in this. Can someone help me to figure it out?

Inside jar look:

edited Apr 06 '16 at 12:51

asked Apr 06 '16 at 12:36

Madhusudan

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Can you verify that the class files are in the correct folder structure inside the jar? – f1sh Apr 06 '16 at 12:41
How can I open jar to verify it? – Madhusudan Apr 06 '16 at 12:42
1

use WinRar, 7Zip or any other compressor. Jar format is based on ZIP and the ZLIB compression format. Check you don't have the "bin" directory directly in your JAR file – Jorge Apr 06 '16 at 12:45
no...there is no bin folder...com/ started and in main directory .classPath and .project exists. Added image for ref. – Madhusudan Apr 06 '16 at 12:50
Your manifest is wrong too, ``manifest.txt`` will not have any effect. It should ne named ``MANIFEST.MF`` and be inside the folder ``META-INF``. – f1sh Apr 06 '16 at 12:51
there is no META-INF folder?? – Madhusudan Apr 06 '16 at 12:55
Make also sure that the class `CasePartitionExtractor` has `main` method – uniknow Apr 06 '16 at 16:12

Error: Could not find or load main class during jar file execution in command prompt

0 Answers0