我有一个 Java 程序,它显示了我系统中可用的端口列表。该程序在命令提示符下运行良好。但是现在我想通过 PL/SQL 使用这个 Java 程序。但我正面临附加的错误。花很多时间但不能成功。下面是我的 Java 程序。import javax.comm.*;import java.util.*;/** List all the ports available on the local machine. **/public class TestPorts{public static void main (String args[]){Enumeration port_list = CommPortIdentifier.getPortIdentifiers();while (port_list.hasMoreElements()){CommPortIdentifier port_id = (CommPortIdentifier)port_list.nextElement();if (port_id.getPortType() == CommPortIdentifier.PORT_SERIAL){System.out.println ("Serial port: " + port_id.getName());}else if (port_id.getPortType() == CommPortIdentifier.PORT_PARALLEL){System.out.println ("Parallel port: " + port_id.getName());}elseSystem.out.println ("Other port: " + port_id.getName());}} // main} // class PortList[enter image description here][1]D:\>loadjava -u hr1/hr1@orcl -v -resolve TestPorts.javaarguments: '-u' 'hr1/hr1@orcl' '-v' '-resolve' 'TestPorts.java'creating : source TestPortsloading : source TestPortsresolving: source TestPortserrors : source TestPorts ORA-29535: source requires recompilation TestPorts:10: cannot resolve symbol symbol : variable CommPortIdentifier location: class TestPorts Enumeration port_list = CommPortIdentifier.getPortIdentifiers(); ^ TestPorts:14: cannot resolve symbol symbol : class CommPortIdentifier location: class TestPorts CommPortIdentifier port_id = (CommPortIdentifier)port_list.nextElement(); ^ TestPorts:14: cannot resolve symbol symbol : class CommPortIdentifier location: class TestPorts CommPortIdentifier port_id = (CommPortIdentifier)port_list.nextElement(); ^
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九州编程
TA贡献1785条经验 获得超4个赞
首先让我们检查数据库上的 CommPortIdentifier.class。
作为 SYS: SELECT object_name, status FROM dba_objects WHERE object_type like '%JAVA%' 和 dbms_java.longname(object_name) like '% CommPortIdentifier%';
如果没有选择行,您可以尝试使用 loadjava 加载包含 CommPortIdentifier.class 的所需 jar 库?然后在数据库上再次编译您的代码。
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