Compiling a Jar w/ a external lib

[ateixeira]

Hello,

Well I'm new to this forum so I'm sorry if I misinterpreted some of this forum rules feel free to point out any mistake, and for my English, since I'm not an English native speaker.

Now, although I program for several years, I've been forced to use an old version of JDeveloper on this project I'm in, and I've had some beginner issues, because I'm used to let the IDE do all the hard work.

My objective is, to compile my project to a jar and execute it in the server.

So far, I got my app to run and work on my IDE which is JDev 9.0.3.2 (OLD) and Java version is 1.3.1_01, but when I try to compile to a jar file for some reason the lib doesn't come along.

My code (partially ofc):

Connection con = null;

public Depositos() throws Exception {
        
        System.out.println("Beginning ORACLE DB connection");

        try {

            String connstr="jdbc:oracle:thin:"+"@<hostname>"+":"+"<port>"+":"+"<SID>";
            System.out.println("connstr ok");

          Class.forName("oracle.jdbc.driver.OracleDriver");
                            
           System.out.println("Class.forName ok");
          con = DriverManager.getConnection (connstr, "cic", "managercic");
            
         System.out.println("Connection successful");
          
        } catch (ClassNotFoundException e) {
              throw new Exception("DB connection error "+e.getMessage());
        }
  
    }

And I suspect the problem is over here, more precisely in here:
"Class.forName("oracle.jdbc.driver.OracleDriver"); "

My procedure is:

On the Depositos.java folder

I run this:

javac -verbose Depositos.java -classpath C:\oracle\ora92\jdbc\lib\classes12.jar

the output says it's all OK.

jar cfmv0 Depositos.jar MANIFEST.MF Depositos.class C:\oracle\ora92\jdbc\lib\classes12.jar

my MANIFEST.MF contains:

Manifest-Version: 1.0
Created-By: Oracle JDeveloper 10.1.3.4.0
Main-Class: Depositos.Depositos

When I run the code from the src folder with:

java Depositos.Depositos

my output is:

Beginning ORACLE DB connection
connstr ok
Exception in thread "main" java.lang.Exception: DB connection error oracle.jdbc.driver.OracleDriver
at Depositos.Depositos.<init>(Depositos.java:47)
at Depositos.Depositos.main(Depositos.java:98)

Which leads me to the conclusion that the error is in the line I stated above.

And I don't understand what I did wrong, I've read so many post from other forums, I don't know what's the right move anymore.

I tried several combinations of compiling commands.

Thank you for your help.

[Norm]

throw new Exception("DB connection error "+e.getMessage());

Its better to get the full text of the error message. Add:
e.printStackTrace();
to the catch block

You need to add the jar file with the missing class to the classpath. One way is to use the java -cp option:

java -cp <THEJARFILE>.jar;. oic.OIC

[ateixeira]

Thank you for the quick reply, that did it for me, I have one other question tho, there's another way to include that <THEJARFILE> in the Depositos.jar so when I run it I don't have to use -cp <THEJARFILE>.jar;. ? And just do something like java -jar Depositos.jar

[Norm]

There is a line in the manifest file where you can specify the classpath: Class-Path:

[Tolls]

jar cfmv0 Depositos.jar MANIFEST.MF Depositos.class C:\oracle\ora92\jdbc\lib\classes12.jar

That's your problem.
You are attempting to add the classes12.jar to your jar file.
Jars should not contain other jars since they cannot reference them.

As Norm says, you should either run it using -cp etc or (prefereably) note the oracle jar in your manifest, and deploy the driver jar file with your app one.

[ateixeira]

Hello again thx for the replies,

I've used this command now:
jar cfmv0 Depositos.jar MANIFEST.MF Depositos.class .\lib\classes12.zip

The content in the MANIFEST.MF file is (w/ the enter at the bottom)
Manifest-Version: 1.0
Created-By: Oracle JDeveloper 10.1.3.4.0
Main-Class: Depositos.Depositos
Class-Path: lib/classes12.zip


but still when I execute the jar file like this @ the src folder I have again (the same thing as before I used the command java -cp oic\lib\classes12.zip;. Depositos.Depositos)

Beginning ORACLE DB connection
connstr ok
Exception in thread "main" java.lang.Exception: DB connection error oracle.jdbc.driver.OracleDriver
at Depositos.Depositos.<init>(Depositos.java:47)
at Depositos.Depositos.main(Depositos.java:98)

command used:
java Depositos.Depositos

And one other thing, I tried to move the files like this to the server to do a test, and I've noticed I can't execute outside the directory where I've created the jar.

I moved the files to this folder:

/home/Me/Depositos/Depositos.jar
/home/Me/Depositos/lib/classes12.zip

And I went to /home/Me/ and use the command as it worked before > java -cp Depositos\lib\classes12.zip;. Depositos.Depositos
the result was Exception in thread "main" java.lang.NoClassDefFoundError: Depositos/Depositos

the server uses Linux, I've done the jar on windows, don't know if that helps.

I've tried a very large number of combinations seen throwout various forums and sites, but none seem to work for me, and I really like to understand the how.

[Tolls]

Hello again thx for the replies,

I've used this command now:
jar cfmv0 Depositos.jar MANIFEST.MF Depositos.class .\lib\classes12.zip

First off, you only jar up the class, not the zip. I told you earlier not to do that since jar (which this zip is) files cannot be referenced inside another jar.

The content in the MANIFEST.MF file is (w/ the enter at the bottom)
Manifest-Version: 1.0
Created-By: Oracle JDeveloper 10.1.3.4.0
Main-Class: Depositos.Depositos
Class-Path: lib/classes12.zip

That's correct there. That tells the JVM (when using java -jar) which is the main class, and where to find dependent jar files (in this case the classes12.zip) in relation to the jar file.

but still when I execute the jar file like this @ the src folder I have again (the same thing as before I used the command java -cp oic\lib\classes12.zip;. Depositos.Depositos)

No.
Since you have supplied the manifest with all the correct details in it you want to use:
java -jar Depositos.jar
That's all.

Beginning ORACLE DB connection
connstr ok
Exception in thread "main" java.lang.Exception: DB connection error oracle.jdbc.driver.OracleDriver
at Depositos.Depositos.<init>(Depositos.java:47)
at Depositos.Depositos.main(Depositos.java:98)

command used:
java Depositos.Depositos

You really need to put printStackTrace() in your exception handling.

And one other thing, I tried to move the files like this to the server to do a test, and I've noticed I can't execute outside the directory where I've created the jar.

I moved the files to this folder:

/home/Me/Depositos/Depositos.jar
/home/Me/Depositos/lib/classes12.zip

And I went to /home/Me/ and use the command as it worked before > java -cp Depositos\lib\classes12.zip;. Depositos.Depositos
the result was Exception in thread "main" java.lang.NoClassDefFoundError: Depositos/Depositos

the server uses Linux, I've done the jar on windows, don't know if that helps.

I've tried a very large number of combinations seen throwout various forums and sites, but none seem to work for me, and I really like to understand the how.

It doesn't work because you didn't tell it where to find the jar file you are executing.
The classpath you gave it (the bit after -cp) only points to the classes12.zip.

[ateixeira]

Thx for the quick reply

Since you have supplied the manifest with all the correct details in it you want to use:
java -jar Depositos.jar
That's all.

I've Tried that, and the result was:
Exception in thread "main" java.lang.NoClassDefFoundError: Depositos/Depositos

It doesn't work because you didn't tell it where to find the jar file you are executing.
The classpath you gave it (the bit after -cp) only points to the classes12.zip.

I've also tried > java -jar Depositos.jar -cp lib/classes12.zip

but that didn't work either...the result was the same as above.

[Norm]

Did you put the Depositos.class file in the Depositos folder inside of the jar file?
Look in the jar file with a zip utility to be see if that class file is in the Depositos folder.

You must have done it once because your code needed to start executing to get: Exception: DB connection error oracle.jdbc.driver.OracleDriver

[ateixeira]

Did you put the Depositos.class file in the Depositos folder inside of the jar file?
Look in the jar file with a zip utility to be see if that class file is in the Depositos folder.

yup it's there, the jar content is

META-INF\MANIFEST.MF
Depositos.class

You must have done it once because your code needed to start executing to get: Exception: DB connection error oracle.jdbc.driver.OracleDriver

It doesn't make sense I know... it's so frustrating...

[Norm]

You must put the Depositos.class file in the Depositos folder inside of the jar file since the class is in that package.
Your post shows that the class file is not in the folder.

[Tolls]

As Norm says, you are telling the JVM that your main class (the class with the main() method) is to be found in the Depositos package (though package names are supposed to start with a lower case), and is called Depositos.
This means the class will be found in a Depositos directory in the jar file.

If it is not to be found there then that is your first problem...you have created a duff jar file.

[ateixeira]

yup, that really was the problem. It's working now, thanks for the help guys.