activiti-explorer 使用db2数据库，启动tomcat时报错

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com.ibm.db2.jcc.am.DisconnectNonTransientConnectionException: [jcc][t4][2030][11211][4.16.53] 在对连接的底层 socket、socket input stream 或 socket output stream 执行操作期间
发生通信错误。错误位置：Reply.fill() - insufficient data (-1)。消息：数据不足。 ERRORCODE=-4499, SQLSTATE=08001
    at com.ibm.db2.jcc.am.fd.a(fd.java:320)
    at com.ibm.db2.jcc.t4.a.a(a.java:526)
    at com.ibm.db2.jcc.t4.a.a(a.java:510)
    at com.ibm.db2.jcc.t4.a.a(a.java:505)
    at com.ibm.db2.jcc.t4.x.b(x.java:294)
    at com.ibm.db2.jcc.t4.x.c(x.java:320)
    at com.ibm.db2.jcc.t4.x.c(x.java:433)
    at com.ibm.db2.jcc.t4.x.v(x.java:1201)
    at com.ibm.db2.jcc.t4.y.a(y.java:51)
    at com.ibm.db2.jcc.t4.b.c(b.java:1353)
    at com.ibm.db2.jcc.t4.b.b(b.java:1225)
    at com.ibm.db2.jcc.t4.b.b(b.java:793)
    at com.ibm.db2.jcc.t4.b.a(b.java:765)
    at com.ibm.db2.jcc.t4.b.a(b.java:423)
    at com.ibm.db2.jcc.t4.b.a(b.java:398)
    at com.ibm.db2.jcc.t4.b.<init>(b.java:336)
    at com.ibm.db2.jcc.DB2SimpleDataSource.getConnection(DB2SimpleDataSource.java:233)
    at com.ibm.db2.jcc.DB2SimpleDataSource.getConnection(DB2SimpleDataSource.java:199)
    at com.ibm.db2.jcc.DB2Driver.connect(DB2Driver.java:474)
    at com.ibm.db2.jcc.DB2Driver.connect(DB2Driver.java:115)
    at java.sql.DriverManager.getConnection(DriverManager.java:582)
    at java.sql.DriverManager.getConnection(DriverManager.java:185)
    at com.DBconn.DBconnect.getConnection(DBconnect.java:36)
    at com.DBconn.DBconnect.main(DBconnect.java:49)
Exception in thread "main" java.lang.NullPointerException
    at com.DBconn.DBconnect.main(DBconnect.java:51)

连接db2的url，采用ip地址，不用localehost或127.0.0.1

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