Unable to Connect to Oracle Database 11g via JDBC - java

I am not able to connect to oracle Database from my machine , but can connect to same DB through SQL developer. I am getting the following exception
java.sql.SQLRecoverableException: IO Error: Connection reset by peer:
socket write error at
oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:428) at
oracle.jdbc.driver.PhysicalConnection.(PhysicalConnection.java:536)
at oracle.jdbc.driver.T4CConnection.(T4CConnection.java:228)
at
oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:32)
at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:521) at
oracle.jdbc.pool.OracleDataSource.getPhysicalConnection(OracleDataSource.java:280)
at
oracle.jdbc.pool.OracleDataSource.getConnection(OracleDataSource.java:207)
at
oracle.jdbc.pool.OracleDataSource.getConnection(OracleDataSource.java:157)
at OrgHierarchy.DBTest.main(DBTest.java:39)
I can also telnet to same DB URL and port.
Other Details: Windows XP , Oracle 11g 11.0.2
thanks.

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For simplicity, the code will the same as:
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I have a problem to connect to SQL Server or Azure SQL.
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I need it for my Java project at school!
Thanks!

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