Java Database Connectivity (JDBC)

hello
see my code snippet:

String sql=.....................
Statement stmt = conn.createStatement();
OracleResultSet rs = (OracleResultSet) stmt.executeQuery(sql);

while (rs.next()) {

CLOB clob = rs.getCLOB("QuartReq");

Reader rd = clob.getCharacterStream();

int nchars = clob.getBufferSize();

System.out.println(nchars);
char[] buffer = new char[nchars];

length=rd.read(buffer);

}

when the highlighted line is executed,the following exception is thrown:


java.io.IOException: 类型长度大于最大值
at oracle.jdbc.dbaccess.DBError.SQLToIOException(DBError.java:716)
at oracle.jdbc.driver.OracleClobReader.needChars(OracleClobReader.java:222)
at oracle.jdbc.driver.OracleClobReader.read(OracleClobReader.java:163)
at java.io.Reader.read(Reader.java:100)
at testclob.ViewClob.doGet(ViewClob.java:64)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:360)
at org.mortbay.jetty.servlet.WebApplicationHandler.dispatch(WebApplicationHandler.java:280)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:553)
at org.mortbay.http.HttpContext.handle(HttpContext.java:1717)
at org.mortbay.jetty.servlet.WebApplicationContext.handle(WebApplicationContext.java:549)
at org.mortbay.http.HttpContext.handle(HttpContext.java:1667)
at org.mortbay.http.HttpServer.service(HttpServer.java:862)
at org.jboss.jetty.Jetty.service(Jetty.java:497)
at org.mortbay.http.HttpConnection.service(HttpConnection.java:759)
at org.mortbay.http.HttpConnection.handleNext(HttpConnection.java:923)
at org.mortbay.http.HttpConnection.handle(HttpConnection.java:776)
at org.mortbay.http.SocketListener.handleConnection(SocketListener.java:202)
at org.mortbay.util.ThreadedServer.handle(ThreadedServer.java:289)
at org.mortbay.util.ThreadPool$PoolThread.run(ThreadPool.java:455)



it is in chinese,mean that the "type length larger then the maximum value".



thank you!