Erro na comunicacao com o iReport

Boa noite a todos.
Eu desenvolvi um sitema no netbeans que passa parametros para uma tela que criei no iReport, mas sempre que executo no netbeans para carregar o report da o seguinte erro:

init:
deps-jar:
compile:
run:
Erro na classe conectar
java.sql.SQLException: Communication link failure: java.io.IOException, underlying cause: Unexpected end of input stream

** BEGIN NESTED EXCEPTION **

java.io.IOException
MESSAGE: Unexpected end of input stream

STACKTRACE:

java.io.IOException: Unexpected end of input stream

at com.mysql.jdbc.MysqlIO.readPacket(MysqlIO.java:1096)

at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:626)

at com.mysql.jdbc.Connection.createNewIO(Connection.java:1562)

at com.mysql.jdbc.Connection.(Connection.java:491)

at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:346)

at java.sql.DriverManager.getConnection(DriverManager.java:525)

at java.sql.DriverManager.getConnection(DriverManager.java:171)

at erp.Relatorio.conectar(Relatorio.java:79)

at erp.Relatorio.(Relatorio.java:28)

at erp.Relatorio.main(Relatorio.java:93)

** END NESTED EXCEPTION **

at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:699)
    at com.mysql.jdbc.Connection.createNewIO(Connection.java:1562)
    at com.mysql.jdbc.Connection.<init>(Connection.java:491)
    at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:346)
    at java.sql.DriverManager.getConnection(DriverManager.java:525)
    at java.sql.DriverManager.getConnection(DriverManager.java:171)
    at erp.Relatorio.conectar(Relatorio.java:79)
    at erp.Relatorio.<init>(Relatorio.java:28)
    at erp.Relatorio.main(Relatorio.java:93)

Problemas while(rs.next())

java.lang.NullPointerException

at erp.Relatorio.(Relatorio.java:34)

at erp.Relatorio.main(Relatorio.java:93)

BUILD SUCCESSFUL (total time: 4 seconds)

Espero que alguem saiba porque esta dando e sse erro…

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