我正在使用 Apache 的 HttpClient 组件来执行以下简单程序，并且看到以下异常：
Exception in thread "main" java.lang.NoSuchFieldError: INSTANCE
at org.apache.http.impl.io.DefaultHttpRequestWriterFactory.(DefaultHttpRequestWriterFactory.java:52)
at org.apache.http.impl.io.DefaultHttpRequestWriterFactory.(DefaultHttpRequestWriterFactory.java:56)
at org.apache.http.impl.io.DefaultHttpRequestWriterFactory.(DefaultHttpRequestWriterFactory.java:46)
at org.apache.http.impl.conn.ManagedHttpClientConnectionFactory.(ManagedHttpClientConnectionFactory.java:72)
at org.apache.http.impl.conn.ManagedHttpClientConnectionFactory.(ManagedHttpClientConnectionFactory.java:84)
at org.apache.http.impl.conn.ManagedHttpClientConnectionFactory.(ManagedHttpClientConnectionFactory.java:59)
at org.apache.http.impl.conn.PoolingHttpClientConnectionManager$InternalConnectionFactory.(PoolingHttpClientConnectionManager.java:487)
at org.apache.http.impl.conn.PoolingHttpClientConnectionManager.(PoolingHttpClientConnectionManager.java:147)
at org.apache.http.impl.conn.PoolingHttpClientConnectionManager.(PoolingHttpClientConnectionManager.java:136)
at org.apache.http.impl.conn.PoolingHttpClientConnectionManager.(PoolingHttpClientConnectionManager.java:112)
at org.apache.http.impl.client.HttpClientBuilder.build(HttpClientBuilder.java:726)
at com.starwood.rms.controller.property.HttpExample.main(HttpExample.java:14)
public class HttpExample {
public static void main(String[] args) {
HttpClient client = HttpClientBuilder.create().build();
HttpGet request = new HttpGet("https://www.google.com/?q=java");
try {
HttpResponse response = client.execute(request);
System.out.println(response.getStatusLine());
} catch (Exception e) {
e.printStackTrace();
}
}
}
我在用
- Httpclient-4.3.3.jar
- httpcore-4.3.2.jar
有任何想法吗？
我在使用 Hadoop 时遇到了这个问题。它使用了旧版本httpclient-4.2.5.jar and httpcore-4.2.5.jar在他们的共享库中。
我通过阴影部分解决了这个问题Maven 阴影插件 https://maven.apache.org/plugins/maven-shade-plugin/
<relocations>
<relocation>
<pattern>org.apache.http</pattern>
<shadedPattern>shaded.org.apache.http</shadedPattern>
</relocation>
</relocations>
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