Question

在我的Tapestry应用程序中，我需要在某个时刻对某个URL执行GET请求。我是这样做的（使用Apache的HttpClient 4.2.1）

String scheme = getScheme();
String host = getHost();
int port = getPort();
String path = getPath();
String paramKey = getParamKey();
String paramValue = getParamValue();

URIBuilder builder = new URIBuilder();
builder
    .setScheme(scheme)
    .setHost(host)
    .setPort(port)
    .setPath(path)
    .setParameter(paramKey, paramValue);

URI uri = builder.build();

HttpGet getRequest = new HttpGet(uri);
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpResponse response = httpClient.execute(getRequest);

当我在Glassfish（3.1.2.2）上部署我的WAR并执行相关代码时，抛出以下异常：

Caused by: org.apache.commons.logging.LogConfigurationException: org.apache.commons.logging.LogConfigurationException: No suitable Log constructor [Ljava.lang.Class;@78aded17 for org.apache.commons.logging.impl.Log4JLogger (Caused by java.lang.NoClassDefFoundError: org/apache/log4j/Category) (Caused by org.apache.commons.logging.LogConfigurationException: No suitable Log constructor [Ljava.lang.Class;@78aded17 for org.apache.commons.logging.impl.Log4JLogger (Caused by java.lang.NoClassDefFoundError: org/apache/log4j/Category))
    at org.apache.commons.logging.impl.LogFactoryImpl.newInstance(LogFactoryImpl.java:543)
    at org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:235)
    at org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:209)
    at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:351)
    at org.apache.http.impl.client.AbstractHttpClient.<init>(AbstractHttpClient.java:187)
    at org.apache.http.impl.client.DefaultHttpClient.<init>(DefaultHttpClient.java:146)

我在我的pom.xml中指定了这个

<dependency>
    <groupId>org.apache.httpcomponents</groupId>
    <artifactId>httpclient</artifactId>
    <version>4.2.1</version>
</dependency>

<dependency>
    <groupId>log4j</groupId>
    <artifactId>log4j</artifactId>
    <version>1.2.14</version>
</dependency>

<dependency>
    <groupId>commons-logging</groupId>
    <artifactId>commons-logging</artifactId>
    <version>1.1.1</version>
</dependency>

我检查并确保“未找到”的类实际上在WEB-INF / lib / log4j-1.2.14中。

有没有办法解决这个问题？

Answer 1

你有一个类加载器问题。也许首先加载另一个使用不同log4j版本的Web应用程序。类加载器使用它找到的类的第一个版本。试试这个：

从app server中删除所有其他应用程序
检查服务器的类路径中是否有其他log4j。

尝试安装并启动您的应用程序。

Apache HTTP Client和日志记录的问题

1 个答案: