Help! Cannot use JDBC and SQLJ

I have installed Oracle8i in Windows 2000. The Universal Installer has installed JDBC driver and SQLJ.

However, I cannot use both of them.
I DOS prompt, I type sqlj
the followig message appears:
Can't find class sqlj\tools\Sqlj

I have installed JDK 1.1.8
I have tried the test program (JDBCVersion) on http://technet.oracle.com/doc/java.815/a64685/getsta3.htm#1003125 The following error message appears:
Can't find class sqlj\tools\Sqlj

I have installed JDK 1.1.8
I have tried the test program (JDBCVersion) on http://technet.oracle.com/doc/java.815/a64685/getsta3.htm#1003125 The following error message appears:

java.sql.SQLException: Io exception: Invalid number format for port number

        at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java)
        at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java)
        at
oracle.jdbc.driver.OracleConnection.<init>(OracleConnection.java)
        at
oracle.jdbc.driver.OracleDriver.getConnectionInstance(OracleDriver.java)
        at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java)
        at java.sql.DriverManager.getConnection(Compiled Code)
        at java.sql.DriverManager.getConnection(DriverManager.java:126)
        at JDBCVersion.main(test.java:13)

Why I canot use JDBC and SQLJ?
What should I do?

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