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From "Benedikt Ritter (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (BEANUTILS-414) Object org.apache.commons.beanutils.ConvertUtilsBean.convert(String value, Class clazz) nullPointException
Date Sat, 23 Feb 2013 14:04:13 GMT

     [ https://issues.apache.org/jira/browse/BEANUTILS-414?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Benedikt Ritter updated BEANUTILS-414:
--------------------------------------

    Fix Version/s: 1.8.4
    
> Object org.apache.commons.beanutils.ConvertUtilsBean.convert(String value, Class clazz)
 nullPointException
> -----------------------------------------------------------------------------------------------------------
>
>                 Key: BEANUTILS-414
>                 URL: https://issues.apache.org/jira/browse/BEANUTILS-414
>             Project: Commons BeanUtils
>          Issue Type: Bug
>          Components: ConvertUtils & Converters
>    Affects Versions: 1.8.3
>         Environment: Java Eclipse
> log4j.jar
>            Reporter: Ken.xu
>            Assignee: Benedikt Ritter
>             Fix For: 1.8.4
>
>
>  在工程做如下类似使用时,系统会报null指针异常。
> [java] view plaincopyprint?
> 01.import org.apache.commons.beanutils.ConvertUtils;  
> 02.  
> 03.public class T {  
> 04.  
> 05.    /** 
> 06.     * @param args 
> 07.     * @author Ken_xu 
> 08.     */  
> 09.    public static void main(String[] args) {  
> 10.        // TODO Auto-generated method stub   
> 11.        Object obj = ConvertUtils.convert("1", null);  
> 12.        System.out.println(obj);  
> 13.    }  
> 14.  
> 15.}  
> import org.apache.commons.beanutils.ConvertUtils;
> public class T {
> 	/**
> 	 * @param args
> 	 * @author Ken_xu
> 	 */
> 	public static void main(String[] args) {
> 		// TODO Auto-generated method stub
> 		Object obj = ConvertUtils.convert("1", null);
> 		System.out.println(obj);
> 	}
> }
>  
> Exception in thread "main" java.lang.NullPointerException
>  at org.apache.commons.beanutils.ConvertUtilsBean.convert(ConvertUtilsBean.java:418)
>  at org.apache.commons.beanutils.ConvertUtils.convert(ConvertUtils.java:217)
>  at T.main(T.java:11)
>  
> 经过分析源代码发现
> Object org.apache.commons.beanutils.ConvertUtilsBean.convert(String value, Class clazz)
> 这个类的这个方法的源代码如下
> [java] view plaincopyprint?
> 01.public Object convert(String value, Class clazz) {  
> 02.  
> 03.    if (log.isDebugEnabled()) {  
> 04.        log.debug("Convert string '" + value + "' to class '" +  
> 05.                  clazz.getName() + "'");  
> 06.    }  
> 07.    Converter converter = lookup(clazz);  
> 08.    if (converter == null) {  
> 09.        converter = lookup(String.class);  
> 10.    }  
> 11.    if (log.isTraceEnabled()) {  
> 12.        log.trace("  Using converter " + converter);  
> 13.    }  
> 14.    return (converter.convert(clazz, value));  
> 15.  
> 16.}  
>     public Object convert(String value, Class clazz) {
>         if (log.isDebugEnabled()) {
>             log.debug("Convert string '" + value + "' to class '" +
>                       clazz.getName() + "'");
>         }
>         Converter converter = lookup(clazz);
>         if (converter == null) {
>             converter = lookup(String.class);
>         }
>         if (log.isTraceEnabled()) {
>             log.trace("  Using converter " + converter);
>         }
>         return (converter.convert(clazz, value));
>     }
>  
> 分析后认为是由于当前工程使用了log4j实现,并且设置了全局debug级别,最终导致报异常。
> 解决方法如下:
> 在log4j.properties配置文件中增加如下代码
> [XML] view plaincopyprint?
> 01.#屏蔽BUG org.apache.commons.beanutils.ConvertUtilsBean.convert(String value, Class
clazz)  
> 02.log4j.logger.org.apache.commons.beanutils=INFO  

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