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[英]Creating an Amazon S3 bucket Using the AWS SDK for Java : Exception in thread "main" java.lang.NoClassDefFoundError
[英]Encountered NoClassDefFoundError when using Amazon AWS SDK
目前,在我的測試EJB project
,我具有以下Stateless
bean:
@WebService(serviceName = "TestService")
@Stateless()
public class TestService {
@WebMethod(operationName = "testUpload")
public void testUpload() {
// DUMMY LINE
Log log = LogFactory.getLog(AmazonS3Client.class);
// END DUMMY LINE
File file = new File("path_to_test_file");
AWSCredentials credentials = new BasicAWSCredentials(AMAZON_KEY_ID, AMAZON_SECRET_KEY);
AmazonS3 conn = new AmazonS3Client(credentials);
conn.setEndpoint("https://s3-ap-southeast-1.amazonaws.com");
PutObjectRequest por = new PutObjectRequest(AMAZON_BUCKET_NAME, "test.txt", file);
conn.putObject(por);
}
}
在我的測試WAR project
,我具有以下ManagedBean
:
@Named(value = "mrBean")
@RequestScoped
public class MrBean {
@WebServiceRef(wsdlLocation = "WEB-INF/wsdl/localhost_8080/TestService/TestService.wsdl")
private TestService_Service service;
private TestService port;
@PostConstruct
public void test() {
port = service.getTestServicePort();
port.testUpload();
}
}
在部署EJB project
並運行test.xhtml
頁面時,總是在以下行遇到錯誤:
AmazonS3 conn = new AmazonS3Client(credentials);
一開始,錯誤看起來像這樣:
Caused by: java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory
at com.amazonaws.services.s3.AmazonS3Client.<clinit>(AmazonS3Client.java:193)
...
Caused by: java.lang.ClassNotFoundException: org.apache.commons.logging.LogFactory
at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
經過幾次試運行后,錯誤變為:
Caused by: java.lang.NoClassDefFoundError: Could not initialize class com.amazonaws.services.s3.AmazonS3Client
有一些奇怪的事情:
testUpload()
函數並粘貼到ManagedBean
,則該函數可以正常工作 。 我100%確定我已經導入了兩個項目中的所有庫。 但是,功能testUpload()
只能在WAR project
,而不能在EJB project
。 Log log = LogFactory.getLog(AmazonS3Client.class);
但是錯誤從來沒有拋出過。 如果您能告訴我如何解決這個問題,我將非常感激:(。
為了解決這個問題,我不得不將EJB Project
打包在EAR Project
。 僅當我部署EAR Project
而不是直接部署EJB Project
,庫才被正確加載。
我仍然沒有找到這個問題的原因。 如果有人可以給我一個解釋,我將不勝感激:)
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