我想在NetBeans中的Java应用程序中通过一个简单的JSP页面来访问我的底层数据库：
<%@ taglib uri="http://java.sun.com/jsp/jstl/sql" prefix="sql" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<sql:query var="rslt" dataSource="jdbc/cart">
select isbn, title, quantity, price from dbsample.books
</sql:query>
<html>
<head>
<title>JDBC Connection Test</title>
</head>
<body>
<h1>Available books:</h1>
<c:forEach var="book" items="${rslt.rows}">
<b>Isbn:</b> ${book.isbn}<br/>
<b>Title:</b> ${book.title}<br/>
<b>Price:</b> $${book.price}<br/>
<b>In stock:</b> ${book.quantity}<br/>
<br/>
</c:forEach>
</body>
</html>
但我遇到了这个错误：
从dbsample.books选择isbn、标题、数量和价格：模式“DBSAMPLE”不存在
这是堆栈跟踪：
javax.servlet.ServletException： select isbn，title，quantity，price from dbsample.books：Schema 'DBSAMPLE' does not exist at org.apache.jasper.runtime.PageContextImpl.doHandlePageException（PageContextImpl.java:951）at org.apache.jasper.runtime.PageContextImpl.handlePageException（PageContextImpl.java: 886）at org.apache.jsp.testPage_jsp._jspService（testPage_jsp.java:80）at org.apache.jasper.runtime.HttpJspBase.service（HttpJspBase.java:111）at javax.servlet.http.HttpServlet.service （HttpServlet.java:790）at org.apache.jasper.servlet.JspServletWrapper.service（JspServletWrapper.java:411）at org.apache.jasper.servlet.JspServlet.serviceJspFile（JspServlet.java:473）at org.apache.jasper.servlet.JspServlet.service（JspServlet.java:377）at javax.servlet.http.HttpServlet.service（HttpServlet.java:790）at org.apache.catalina.core.StandardWrapper.service（StandardWrapper.java:1682）at org.apache.catalina.core.ApplicationDispatcher.doInvoke（ApplicationDispatcher.java:875）at org.apache.catalina.core.ApplicationDispatcher.invoke（ApplicationDispatcher.java:739）at org.apache.catalina.core.ApplicationDispatcher.processRequest（ApplicationDispatcher.java:575）at org.apache.catalina.core.ApplicationDispatcher.doDispatch（ApplicationDispatcher.java:546）at org.apache.catalina.core.ApplicationDispatcher.dispatch（ApplicationDispatcher.java:428）at org.apache.catalina.core.ApplicationDispatcher.forward（ApplicationDispatcher.java:378）at com.sun.faces.context.ExternalContextImpl.dispatch（ExternalContextImpl.java:630）at com.sun.faces.application.view.JspViewHandlingStrategy.executePageToBuildView（JspViewHandlingStrategy.java:363）at com.sun.faces.application.view.JspViewHandlingStrategy.buildView（JspViewHandlingStrategy.java:153）at com.sun.faces.lifecycle.RenderResponsePhase.execute（RenderResponsePhase.java:99）at com.sun.faces.lifecycle.Phase.doPhase（ Phase.java:101）at com.sun.faces.lifecycle.LifecycleImpl.render（LifecycleImpl.java:219）at javax.faces.webapp.FacesServlet.service（FacesServlet.java:647）at org.apache.catalina.core.StandardWrapper.service（StandardWrapper.java:1682）at org.apache.catalina.core.StandardWrapperValve.invoke（ StandardWrapperValve.java:318）at org.apache.catalina.core.StandardContextValve.invoke（StandardContextValve.java:160）at org.apache.catalina.core.StandardPipeline.doInvoke（StandardPipeline.java:734）at org.apache.catalina.core.StandardPipeline.invoke（StandardPipeline.java:673）at com.sun.enterprise.web.WebPipeline.invoke（WebPipeline.java:99）at org.apache.catalina.core.StandardHostValve.invoke（StandardHostValve.java:174）at org.apache.catalina.connector.CoyoteAdapter.doService（CoyoteAdapter.java:357）at org.apache.catalina.connector.CoyoteAdapter.service（CoyoteAdapter.java:260）at com.sun.enterprise.v3.services.impl.ContainerMapper.service（ContainerMapper.java:188）at org.glassfish.grizzly.http.server.HttpHandler.runService（HttpHandler.java:191）at org.glassfish.grizzly.http.server.HttpHandler.doHandle（HttpHandler.java: 168）at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead（HttpServerFilter.java:189）at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute（ExecutorResolver.java:119）at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter（ DefaultFilterChain.java:288）at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart（DefaultFilterChain.java:206）at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute（DefaultFilterChain.java:136）at org.glassfish.grizzly.filterchain.DefaultFilterChain.process（DefaultFilterChain.java:114）at org.glassfish.grizzly.ProcessorExecutor.execute（ProcessorExecutor.java:77）at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent（TCPNIOTransport.java:838）at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent（AbstractIOStrategy.java:113）at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0（WorkerThreadIOStrategy.java:115）at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100（WorkerThreadIOStrategy.java:55）at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy $WorkerThreadRunnable.run（WorkerThreadIOStrategy.java:135）at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork（ AbstractThreadPool.java:564）at org.glassfish.grizzly.threadpool.AbstractThreadPool$ Worker.run（AbstractThreadPool.java:544）at java.lang.Thread.run(Thread.java:现在我已经检查了我的web.xml。据我所知，部署描述符是正确的。我已经检查了我的数据源，根据我的persistance.xml它似乎是正确的。我对数据库池进行了ping测试，也成功了。我的模式名为dbsample，有一个名为books的表。
所以我不知道为什么它说我的DBSAMPLE不存在。非常感谢任何帮助。
编辑#1：在数据库中执行SQL命令时完全正常。