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Exception Error - Please help I've tried everything!

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Greg Peters

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Nov 26, 2006, 2:48:36 AM11/26/06
to
Hello all,
 
I'm trying to get the following simple program to run just to confirm a connection to the database:
 
//PostgresqlClient.java

import java.sql.*;

public class PostgresqlClient{
    public static void main(String[] arguments)
        throws ClassNotFoundException, SQLException{
       
        String driver = "org.postgresql.Driver";
        String url ="localhost";
        String user = "root";
        String pwd = "password";
       
        Class.forName(driver);
       
        Connection con = DriverManager.getConnection(url, user, pwd);
        System.err.println("Connection complete");
       
        con.close();
    }
}

 

I keep getting the folowing errors:

Exception in thread "main" java.lang.ClassNotFoundException: org.postgresql.Driver
        at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
        at java.security.AccessController.doPrivileged (Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java :268)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
        at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName (Class.java:164)
        at PostgresqlClient.main(PostgresqlClient.java:12)
Java Result: 1
BUILD SUCCESSFUL (total time: 0 seconds)

I have tried adding the postgresql.jar file to my CLASSPATH, and have also tried copying the postgresql.jar file to the same directory as the PostgresqlClient.java and PostgresqlClient.class directories. I have also tried running the following from the command line:

java -classpath postgresql.jar PostgresqlClient.class

I am using jdk1.5.0_09 and have tried using nearly all the available postgresql.jar files available.

Any advice would be most appreciated.

Cheers,

Greg Peters....

 

 

 

 

 

 

Chuck Davis

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Nov 26, 2006, 10:46:32 AM11/26/06
to
Greg:

If you're running from inside NB you need to add the PG driver as a
library to NB. If you have the driver on your classpath then your
class should run fine outside of NB. Test and let us know if it runs
outside of NB or if you have success adding the driver as a library in
NB.

I use Postgresql and it works beautifully. Be encouraged that if you
get the right combo you'll have a superior environment!

Chuck

On 11/25/06, Greg Peters <gregpe...@gmail.com> wrote:
> Hello all,
>
> I'm trying to get the following simple program to run just to confirm a
> connection to the database:
>
> //PostgresqlClient.java
>
> import java.sql.*;
>
> public class PostgresqlClient{
> public static void main(String[] arguments)
> throws ClassNotFoundException, SQLException{
>
> String driver = "org.postgresql.Driver";
> String url ="localhost";
> String user = "root";
> String pwd = "password";
>
> Class.forName(driver);
>
> Connection con = DriverManager.getConnection(url, user, pwd);
> System.err.println("Connection complete");
>
> con.close();
> }
> }
>
>
>
> I keep getting the folowing errors:
>
> Exception in thread "main" java.lang.ClassNotFoundException:
> org.postgresql.Driver
> at java.net.URLClassLoader$1.run(URLClassLoader.java:200)

> at java.security.AccessController.doPrivileged(Native Method)


> at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
> at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:268)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
> at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
> at java.lang.Class.forName0(Native Method)

> at java.lang.Class.forName(Class.java:164)


> at PostgresqlClient.main(PostgresqlClient.java:12)
> Java Result: 1
> BUILD SUCCESSFUL (total time: 0 seconds)
>
> I have tried adding the postgresql.jar file to my CLASSPATH, and have also
> tried copying the postgresql.jar file to the same directory as the
> PostgresqlClient.java and PostgresqlClient.class directories. I have also
> tried running the following from the command line:
>
> java -classpath postgresql.jar PostgresqlClient.class
>
> I am using jdk1.5.0_09 and have tried using nearly all the available
> postgresql.jar files available.
>
> Any advice would be most appreciated.
>
> Cheers,
>
> Greg Peters....
>
>

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Greg Peters

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Nov 26, 2006, 6:21:58 PM11/26/06
to
Chuck,
 
Thanks for your input. I will see if adding the PG driver to the NB library helps when I get home from work today. However, as I mentioned, I was unable to get it to work from the command prompt either, even when specifically providing a classpath with the command: 
 
java -classpath postgresql.jar PostgresqlClient.class   (both files are in the same directory)
 
I know what you mean by psql being a good platform. I have been using it the last few months and have been impressed. Currently all my user interfaces have been web based using php (i see myself a semi-expert), but I am now trying to break into the java scene (really just learning the basics). I am ultimately going to make an interactive map, with object locations stored in the database and a friendly gui interface - well that's the plan anyway.....
 
Thanks again,
 
Greg.
 

 

Reuben Pasquini

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Nov 26, 2006, 7:04:23 PM11/26/06
to
Hi Greg,

Here are a couple ideas.

*. You can verify that you have a good jar file by running:
jar tf postgresql.jar
- org.postgresql.Driver should be listed in the jar contents.

*. You're launching your app with the wrong command line:
$ java -cp postgresql.jar PostgresqlClient.class
Exception in thread "main" java.lang.NoClassDefFoundError:
PostgresqlClient/class

Use this instead:
$ java -cp postgresql.jar:. PostgresqlClient
Exception in thread "main" java.sql.SQLException: No suitable
driver
at java.sql.DriverManager.getConnection(DriverManager.java:545)
at java.sql.DriverManager.getConnection(DriverManager.java:171)
at PostgresqlClient.main(PostgresqlClient.java:15)

Finally - that last error is because you're using an incorrectly
formatted URL.
Set
String url = "jdbc:postgresql:littleware://localhost:
5432";

$ javac PostgresqlClient.java

I don't have a 'root' user - but this will hopefully get you a little
closer ...

$ java -cp postgresql.jar:. PostgresqlClient
Exception in thread "main" org.postgresql.util.PSQLException: FATAL:
role "root" does not exist
at
org.postgresql.core.v3.ConnectionFactoryImpl.readStartupMessages
(ConnectionFactoryImpl.java:443)
at
org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl
(ConnectionFactoryImpl.java:98)
at org.postgresql.core.ConnectionFactory.openConnection
(ConnectionFactory.java:65)
at org.postgresql.jdbc2.AbstractJdbc2Connection.<init>
(AbstractJdbc2Connection.java:116)
at org.postgresql.jdbc3.AbstractJdbc3Connection.<init>
(AbstractJdbc3Connection.java:30)
at org.postgresql.jdbc3.Jdbc3Connection.<init>
(Jdbc3Connection.java:24)
at org.postgresql.Driver.makeConnection(Driver.java:369)
at org.postgresql.Driver.connect(Driver.java:245)
at java.sql.DriverManager.getConnection(DriverManager.java:525)
at java.sql.DriverManager.getConnection(DriverManager.java:171)
at PostgresqlClient.main(PostgresqlClient.java:15)


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Andrew Lazarus

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Nov 26, 2006, 11:35:08 PM11/26/06
to
Sorry to jump in mid-thread; I no longer read every message. But I do use NB 5.0 and 5.5 with no problem. Are you passing in -Djdbc.driver=org.postgresql.Driver to the VM? You don't in the example java -classpath etc. line below which is why it doesn't work. You can put it into the NB project by right-clicking the project in the project pane, going to "Properties", Run, and adding the -D command to the "extra parameters" text box.

I believe that in the alternative, you can do a Class.forName("org.postgresql.Driver") in your code before you start accessing the DB. The java.sql code doesn't know WHICH jdbc driver to load when you open the DB until you tell it.

--
Andrew Lazarus dr...@attglobal.net

Greg Peters

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Nov 27, 2006, 3:43:24 AM11/27/06
to
OK. This is driving me crazy. I have the postgresql.jar file in the same directory. This is my directory listing:


C:\Documents and Settings\java\GregScratch\src>dir
 Volume in drive C has no label.
 Volume Serial Number is B468-3FBB

 Directory of C:\Documents and Settings\java\GregScratch\src

27/11/2006  06:25 PM    <DIR>          .
27/11/2006  06:25 PM    <DIR>          ..
26/11/2006  10:36 PM               726 CheckString.java
24/11/2006  11:51 PM               140 helloworldapp.java
26/11/2006  05:11 PM           402,906 postgresql.jar
27/11/2006  06:25 PM             1,179 PostgresqlClient.class
27/11/2006  06:25 PM               545 PostgresqlClient.java
26/11/2006  02:49 PM               617 SetPoints.java
26/11/2006  01:44 AM               641 VolcanoApplication.java
26/11/2006  01:44 AM               432 VolcanoRobot.java
               8 File(s)        407,186 bytes
               2 Dir(s)  165,819,129,856 bytes free

C:\Documents and Settings\java\GregScratch\src>

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

 I tried running:
 
jar tf postgresql.jar
 
and got:

C:\Documents and Settings\java\GregScratch\src>jar tf postgresql.jar
META-INF/
META-INF/MANIFEST.MF
org/
org/postgresql/
org/postgresql/Driver$1.class
org/postgresql/Driver$ConnectThread.class
org/postgresql/Driver.class
org/postgresql/PGConnection.class
org/postgresql/PGNotification.class
org/postgresql/PGRefCursorResultSet.class
org/postgresql/PGResultSetMetaData.class
org/postgresql/PGStatement.class
org/postgresql/core/
org/postgresql/core/BaseConnection.class
org/postgresql/core/BaseResultSet.class
org/postgresql/core/BaseStatement.class
org/postgresql/core/ConnectionFactory.class
org/postgresql/core/Encoding.class
org/postgresql/core/Field.class
org/postgresql/core/Notification.class
org/postgresql/core/Oid.class
org/postgresql/core/PGBindException.class
org/postgresql/core/PGStream$1.class
org/postgresql/core/PGStream.class
org/postgresql/core/ParameterList.class
org/postgresql/core/ProtocolConnection.class
org/postgresql/core/Query.class
org/postgresql/core/QueryExecutor.class
org/postgresql/core/ResultCursor.class
org/postgresql/core/ResultHandler.class
org/postgresql/core/UTF8Encoding.class
org/postgresql/core/Utils.class
org/postgresql/core/types/
org/postgresql/core/types/PGBigDecimal.class
org/postgresql/core/types/PGBoolean.class
org/postgresql/core/types/PGByte.class
org/postgresql/core/types/PGDouble.class
org/postgresql/core/types/PGFloat.class
org/postgresql/core/types/PGInteger.class
org/postgresql/core/types/PGLong.class
org/postgresql/core/types/PGNumber.class
org/postgresql/core/types/PGShort.class
org/postgresql/core/types/PGString.class
org/postgresql/core/types/PGType.class
org/postgresql/core/types/PGUnknown.class
org/postgresql/core/v2/
org/postgresql/core/v2/ConnectionFactoryImpl$SimpleResultHandler.class
org/postgresql/core/v2/ConnectionFactoryImpl.class
org/postgresql/core/v2/FastpathParameterList.class
org/postgresql/core/v2/ProtocolConnectionImpl.class
org/postgresql/core/v2/QueryExecutorImpl$1.class
org/postgresql/core/v2/QueryExecutorImpl$2.class
org/postgresql/core/v2/QueryExecutorImpl$3.class
org/postgresql/core/v2/QueryExecutorImpl.class
org/postgresql/core/v2/SimpleParameterList.class
org/postgresql/core/v2/V2Query.class
org/postgresql/core/v3/
org/postgresql/core/v3/CompositeParameterList.class
org/postgresql/core/v3/CompositeQuery.class
org/postgresql/core/v3/ConnectionFactoryImpl$1.class
org/postgresql/core/v3/ConnectionFactoryImpl$UnsupportedProtocolException.class
org/postgresql/core/v3/ConnectionFactoryImpl.class
org/postgresql/core/v3/Portal.class
org/postgresql/core/v3/ProtocolConnectionImpl.class
org/postgresql/core/v3/QueryExecutorImpl$1.class
org/postgresql/core/v3/QueryExecutorImpl$2.class
org/postgresql/core/v3/QueryExecutorImpl$3.class
org/postgresql/core/v3/QueryExecutorImpl$ErrorTrackingResultHandler.class
org/postgresql/core/v3/QueryExecutorImpl.class
org/postgresql/core/v3/SimpleParameterList.class
org/postgresql/core/v3/SimpleQuery.class
org/postgresql/core/v3/V3ParameterList.class
org/postgresql/core/v3/V3Query.class
org/postgresql/ds/
org/postgresql/ds/PGConnectionPoolDataSource.class
org/postgresql/ds/PGPoolingDataSource$1.class
org/postgresql/ds/PGPoolingDataSource.class
org/postgresql/ds/PGSimpleDataSource.class
org/postgresql/ds/common/
org/postgresql/ds/common/BaseDataSource.class
org/postgresql/ds/common/PGObjectFactory.class
org/postgresql/ds/common/PooledConnectionImpl$ConnectionHandler.class
org/postgresql/ds/common/PooledConnectionImpl$StatementHandler.class
org/postgresql/ds/common/PooledConnectionImpl.class
org/postgresql/fastpath/
org/postgresql/fastpath/Fastpath.class
org/postgresql/fastpath/FastpathArg.class
org/postgresql/geometric/
org/postgresql/geometric/PGbox.class
org/postgresql/geometric/PGcircle.class
org/postgresql/geometric/PGline.class
org/postgresql/geometric/PGlseg.class
org/postgresql/geometric/PGpath.class
org/postgresql/geometric/PGpoint.class
org/postgresql/geometric/PGpolygon.class
org/postgresql/jdbc2/
org/postgresql/jdbc2/AbstractJdbc2Array.class
org/postgresql/jdbc2/AbstractJdbc2Blob.class
org/postgresql/jdbc2/AbstractJdbc2BlobClob$LOIterator.class
org/postgresql/jdbc2/AbstractJdbc2BlobClob.class
org/postgresql/jdbc2/AbstractJdbc2Clob.class
org/postgresql/jdbc2/AbstractJdbc2Connection$1.class
org/postgresql/jdbc2/AbstractJdbc2Connection$TransactionCommandHandler.class
org/postgresql/jdbc2/AbstractJdbc2Connection.class
org/postgresql/jdbc2/AbstractJdbc2DatabaseMetaData.class
org/postgresql/jdbc2/AbstractJdbc2ResultSet$CursorResultHandler.class
org/postgresql/jdbc2/AbstractJdbc2ResultSet$NullObject.class
org/postgresql/jdbc2/AbstractJdbc2ResultSet$PrimaryKey.class
org/postgresql/jdbc2/AbstractJdbc2ResultSet.class
org/postgresql/jdbc2/AbstractJdbc2ResultSetMetaData.class
org/postgresql/jdbc2/AbstractJdbc2Statement$BatchResultHandler.class
org/postgresql/jdbc2/AbstractJdbc2Statement$StatementResultHandler.class
org/postgresql/jdbc2/AbstractJdbc2Statement.class
org/postgresql/jdbc2/EscapedFunctions.class
org/postgresql/jdbc2/ResultWrapper.class
org/postgresql/jdbc2/TimestampUtils$1.class
org/postgresql/jdbc2/TimestampUtils$ParsedTimestamp.class
org/postgresql/jdbc2/TimestampUtils.class
org/postgresql/jdbc2/TypeInfoCache.class
org/postgresql/jdbc2/optional/
org/postgresql/jdbc2/optional/ConnectionPool.class
org/postgresql/jdbc2/optional/PoolingDataSource.class
org/postgresql/jdbc2/optional/SimpleDataSource.class
org/postgresql/jdbc3/
org/postgresql/jdbc3/AbstractJdbc3Blob.class
org/postgresql/jdbc3/AbstractJdbc3Clob.class
org/postgresql/jdbc3/AbstractJdbc3Connection.class
org/postgresql/jdbc3/AbstractJdbc3DatabaseMetaData.class
org/postgresql/jdbc3/AbstractJdbc3ResultSet.class
org/postgresql/jdbc3/AbstractJdbc3Statement.class
org/postgresql/jdbc3/Jdbc3Array.class
org/postgresql/jdbc3/Jdbc3Blob.class
org/postgresql/jdbc3/Jdbc3CallableStatement.class
org/postgresql/jdbc3/Jdbc3Clob.class
org/postgresql/jdbc3/Jdbc3Connection.class
org/postgresql/jdbc3/Jdbc3ConnectionPool.class
org/postgresql/jdbc3/Jdbc3DatabaseMetaData.class
org/postgresql/jdbc3/Jdbc3PoolingDataSource.class
org/postgresql/jdbc3/Jdbc3PreparedStatement.class
org/postgresql/jdbc3/Jdbc3ResultSet.class
org/postgresql/jdbc3/Jdbc3ResultSetMetaData.class
org/postgresql/jdbc3/Jdbc3SimpleDataSource.class
org/postgresql/jdbc3/Jdbc3Statement.class
org/postgresql/jdbc3/PSQLParameterMetaData.class
org/postgresql/jdbc3/PSQLSavepoint.class
org/postgresql/largeobject/
org/postgresql/largeobject/BlobInputStream.class
org/postgresql/largeobject/BlobOutputStream.class
org/postgresql/largeobject/LargeObject.class
org/postgresql/largeobject/LargeObjectManager.class
org/postgresql/ssl/
org/postgresql/ssl/MakeSSL.class
org/postgresql/ssl/NonValidatingFactory$NonValidatingTM.class
org/postgresql/ssl/NonValidatingFactory.class
org/postgresql/ssl/WrappedFactory.class
org/postgresql/util/
org/postgresql/util/Base64.class
org/postgresql/util/GT.class
org/postgresql/util/MD5Digest.class
org/postgresql/util/PGInterval.class
org/postgresql/util/PGbytea.class
org/postgresql/util/PGmoney.class
org/postgresql/util/PGobject.class
org/postgresql/util/PGtokenizer.class
org/postgresql/util/PSQLDriverVersion.class
org/postgresql/util/PSQLException.class
org/postgresql/util/PSQLState.class
org/postgresql/util/PSQLWarning.class
org/postgresql/util/ServerErrorMessage.class
org/postgresql/util/StreamWrapper.class
org/postgresql/util/UnixCrypt.class
org/postgresql/xa/
org/postgresql/xa/PGXAConnection.class
org/postgresql/xa/PGXADataSource.class
org/postgresql/xa/PGXAException.class
org/postgresql/xa/RecoveredXid.class
org/postgresql/translation/
org/postgresql/translation/messages_cs.class
org/postgresql/translation/messages_de.class
org/postgresql/translation/messages_es.class
org/postgresql/translation/messages_fr.class
org/postgresql/translation/messages_it.class
org/postgresql/translation/messages_nl.class
org/postgresql/translation/messages_pl.class
org/postgresql/translation/messages_pt_BR.class
org/postgresql/translation/messages_ru.class
org/postgresql/translation/messages_tr.class
org/postgresql/translation/messages_zh_CN.class
org/postgresql/translation/messages_zh_TW.class
 
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 
This is PostgressqlClient.java as it currently stands:
 

import java.sql.*;

public class PostgresqlClient{
    public static void main(String[] Arguments)


        throws ClassNotFoundException, SQLException{
       
        String driver = "org.postgresql.Driver";

        String url ="jdbc:postgresql:CSG";

        String user = "root";
        String pwd = "password";
       
        Class.forName(driver);
       
        Connection con = DriverManager.getConnection(url, user, pwd);
        System.err.println("Connection complete");
       
        con.close();
    }
}

 
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 
This is some of the commands I have tried and their results:
 


C:\Documents and Settings\java\GregScratch\src>java -cp postgresql.jar:. PostgresqlClient.class


Exception in thread "main" java.lang.NoClassDefFoundError: PostgresqlClient/class

C:\Documents and Settings\java\GregScratch\src>java -cp postgresql.jar:. PostgresqlClient.class


Exception in thread "main" java.lang.NoClassDefFoundError: PostgresqlClient/class

C:\Documents and Settings\java\GregScratch\src>java -cp postgresql.jar. PostgresqlClient.class


Exception in thread "main" java.lang.NoClassDefFoundError: PostgresqlClient/class

C:\Documents and Settings\java\GregScratch\src>java -cp postgresql.jar PostgresqlClient.class


Exception in thread "main" java.lang.NoClassDefFoundError: PostgresqlClient/class

C:\Documents and Settings\java\GregScratch\src>java -cp postgresql.jar PostgresqlClient
Exception in thread "main" java.lang.NoClassDefFoundError: PostgresqlClient

C:\Documents and Settings\java\GregScratch\src>java -cp postgresql.jar:. PostgresqlClient
Exception in thread "main" java.lang.NoClassDefFoundError: PostgresqlClient

C:\Documents and Settings\java\GregScratch\src>

+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

This is what NB says (and I think I have added the module correctly):

Exception in thread "main" java.lang.ClassNotFoundException: org.postgresql.Driver
        at java.net.URLClassLoader$1.run(URLClassLoader.java:200)

        at java.security.AccessController.doPrivileged (Native Method)


        at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java :268)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
        at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
        at java.lang.Class.forName0(Native Method)

        at java.lang.Class.forName (Class.java:164)


        at PostgresqlClient.main(PostgresqlClient.java:12)
Java Result: 1
BUILD SUCCESSFUL (total time: 0 seconds)

Any ideas????

I have tried several versions of the postgresql module from the website too.

Cheers,

Greg.

 

 

 

 

Vit Timchishin

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Nov 27, 2006, 5:05:19 AM11/27/06
to
Here are few guides:
1) Do not pass file name to "java". Pass fully qualified class name.
Your call should be "java -cp postgresql.jar:. PostgresqlClient"
2) You can use "-verbose" to check what jar files or classes are loaded.
3) For netbeans ensure you have jar in "Project properties" -> "Libraries"

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Greg Peters

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Nov 27, 2006, 6:29:11 AM11/27/06
to
Thank you very much. That did it! Many thanks to all of you for your help! I also got it to work in NB, with some fiddling. It turns out I didn't add the library to the project properly. Thanks guys. I was just about to give up on java and have a go at python!
 
Can someone explain why the .; is necessary at all?
 
Cheers,
 
Greg


 
On 11/27/06, Sebastian Esch <es...@in.tum.de> wrote:
Hi Greg!

Try "java -cp .;postgresql.jar PostgresqlClient"

On Windows the separator char for the classpath is ; not :. And it works
for me only if the . is the first element of the classpath.

Achilleas Mantzios

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Nov 27, 2006, 7:01:34 AM11/27/06
to
Στις Δευτέρα 27 Νοέμβριος 2006 13:29, ο/η Greg Peters έγραψε:
> Thank you very much. That did it! Many thanks to all of you for your help!
> I also got it to work in NB, with some fiddling. It turns out I didn't add
> the library to the project properly. Thanks guys. I was just about to give
> up on java and have a go at python!
>
> Can someone explain why the .; is necessary at all?

PostgresqlClient.class lies in your current directory ("."),
and adding the "." directory to the class path makes java
aware of all classes in the "." "package".

java will not assume you always want to have your current dir
in your classpath, and hence the need for the explicit ".".

>
> Cheers,
>
> Greg
>
> On 11/27/06, Sebastian Esch <es...@in.tum.de> wrote:
> > Hi Greg!
> >
> > Try "java -cp .;postgresql.jar PostgresqlClient"
> >
> > On Windows the separator char for the classpath is ; not :. And it works
> > for me only if the . is the first element of the classpath.

--
Achilleas Mantzios

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