Spring Bean属性'xxx'不可写或具有无效的setter方法

Question

我是一个看似简单的Spring问题的Spring新手.我工作了几个小时没有运气.这是例外,后面是代码(提前谢谢):

Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'graphiteWriterSession' defined in file [/home/user/resources/jmxtrans.graphite.xml]: Error setting property values; nested exception is org.springframework.beans.NotWritablePropertyException: Invalid property 'host' of bean class [com.example.ExampleClass]: Bean property 'host' is not writable or has an invalid setter method. Does the parameter type of the setter match the return type of the getter?

我的bean定义:

<bean id="graphiteWriterSession" class="com.example.ExampleClass">
    <property name="host" value="host.example.com" />
    <property name="port" value="2023" />
    <property name="namespacePrefix" value="apps.foo.bar" />
    <property name="debug" value="true" />
</bean>

<bean id="jmxtransSession" class="com.example.MainMethodClass" factory-method="getInstance">
    <property name="graphiteWriterSession" ref="graphiteWriterSession" />
</bean>

代码段:

package com.example.ExampleClass;
import com.googlecode.jmxtrans.model.output.GraphiteWriter;

public class ExampleClass {

   private static final long   serialVersionUID = 1L;
   private String              host;
   private int                 port;
   private GraphiteWriter      gw;

  public ExampleClass() {
  }

  public GraphiteWriter getWriter() {
    gw = new GraphiteWriter();
    gw.addSetting(GraphiteWriter.PORT, port);
    gw.addSetting(GraphiteWriter.HOST, host);
    return gw;
  }

  // =====================================================
  // set/get methods for Carbon host.
  // Plugged into Spring application-context file.
  // =====================================================
  public void setCarbonHost( String host ) {
       this.host = host;
  }

  public String getCarbonHost() {
       return host;
  }
  // =====================================================


  // =====================================================
  // set/get methods for Carbon port.
  // Plugged into Spring application-context file.
  // =====================================================
  public void setCarbonPort( int port ) {
      this.port = port;
  }

  public int getCarbonPort() {
      return port;
  }
  // =====================================================
}

我没有在这里包含驱动程序(包含main方法)类.虽然该驱动程序类依赖于上面的类,但驱动程序类本身没有问题(我不相信).

上面的错误显示'host'属性有问题但是,正如您所料,'port'属性具有相同的问题(恰好首先评估'host'属性).

谁能告诉我哪里出错了？如果你愿意,请随意解释,因为我本身不是一个春天的人.谢谢.

Answer 1

1)对于主机,您应该定义公共getHost()和setHost(String s)
方法,类似于您需要的端口getPort()和setPort(int v)方法.

这就是Spring需要初始化bean的方法.

我认为它特别需要设置器(在这种情况下).

要么 ...

2)您可以将XML文件中的属性重命名为

carbonHost和carbonPort.这也应该这样做.

Answer 2

问题是您<property name="port" value="2023" />在bean配置中使用,但ExampleClass调用了相应的方法setCarbonPort(int port).

解决方案:更新xml <property name="carbonPort" value="2023" />或方法setPort(int port).