java.sql.SQLException: Listener refused the connection with the following error: ORA-12519, TNS:no appropriate service handler found The Connection descriptor used by the client was: localhost:1521:XE

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Root Cause Analysis

  1. java.sql.SQLException

    Listener refused the connection with the following error: ORA-12519, TNS:no appropriate service handler found The Connection descriptor used by the client was: localhost:1521:XE

    at oracle.jdbc.driver.DatabaseError.throwSqlException()
  2. Oracle jdbc
    OracleDriver.connect
    1. oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:145)
    2. oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:380)
    3. oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:401)
    4. oracle.jdbc.driver.PhysicalConnection.<init>(PhysicalConnection.java:441)
    5. oracle.jdbc.driver.T4CConnection.<init>(T4CConnection.java:165)
    6. oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:35)
    7. oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:839)
    7 frames