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我寫了與Java工作正常HBase的一個基本的Java代碼。與Java Servlet的運行HBase的
public class HBaseTest {
public static String newFunc() throws IOException {
// Instantiating configuration class
Configuration config = HBaseConfiguration.create();
Connection connection = ConnectionFactory.createConnection(config);
Table table = connection.getTable(TableName.valueOf("customer"));
Get g = new Get(Bytes.toBytes("jsmith"));
Result result = table.get(g);
// Reading values from Result class object
byte[] value = result.getValue(Bytes.toBytes("addr"), Bytes.toBytes("city"));
return Bytes.toString(value);
}
}
所以我決定使用此代碼和HBase的作爲我的Web應用程序開發的一部分,所以我在Eclipse的Java EE IDE中打開一個新的動態Web項目,添加文件,改變了功能的名稱,並呼籲它來自一個servlet。我還添加了所需的jar文件。 但我堅持了以下錯誤:
java.lang.ClassNotFoundException: org.apache.hadoop.hbase.HBaseConfiguration
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1332)
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1166)
at HBaseTest.newFunc(HBaseTest.java:18)
at BakwasServlet.doGet(BakwasServlet.java:16)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:292)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:528)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1099)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:670)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1520)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1476)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)
這個錯誤現在折騰我。有沒有人遇到過這種情況,或者有誰能幫我解決這個問題?我沒有設置hbase_home變量。我也不需要它用於java代碼。
在此先感謝!
你在哪裏添加的HBase的JAR文件?它應該位於Web應用程序的WEB-INF/lib'文件夾中。 (順便說一句,有你用Google搜索'ClassNotFoundException的org.apache.hadoop.hbase.HBaseConfiguration'?有很多的結果,也有不少在這裏SO) –
我直接加載的jar文件中的項目並沒有做它在WEB_INF/lib中。請繼續寫下你的評論作爲答案,以便我可以標記它。謝謝! – LearningToCode