我想建立一個簡單的JDBC Spring模板的應用程序,我使用的web框架是檢票口,並在碼頭6 Web服務器(通過碼頭的Maven插入)。另外,我正在用Eclipse構建應用程序。問題,在網絡環境下的NoClassDefFoundError錯誤春/檢票/德比/碼頭
出於某種原因,我正在與德比的JDBC類的NoClassDefFoundError。我假設我會得到一個沒有找到的類未找到的異常,所以我猜猜別的事情正在發生。 derby類是類路徑的一部分,即WEB-INF/lib目錄。你認爲這個問題是什麼?
我對這個問題的看法:它不是一個「在類路徑中找不到的jar」錯誤,但更多的是Java或Spring動態加載該類以及何時加載它的問題。
我使用Eclipse作爲開發工具,但它可能不是問題的一部分。我仍然在命令行上使用Maven並獲得相同的問題。
以下是錯誤:
WicketMessage:
java.lang.NoClassDefFoundError: Could not initialize class org.apache.derby.jdbc.EmbeddedDriver
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:169)
at org.apache.commons.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:1130)
at org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource.java:880)
at org.springframework.jdbc.datasource.DataSourceUtils.doGetConnection(DataSourceUtils.java:113)
at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:79)
at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:577)
at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:619)
at wicketspring.easy.jdbc.JdbcWicketSpringHandler.data(JdbcWicketSpringHandler.java:39)
at WICKET_wicketspring.easy.jdbc.JdbcWicketSpringHandler$$FastClassByCGLIB$$f1187cb6.invoke(<generated>)
at net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:191)
at org.apache.wicket.proxy.LazyInitProxyFactory$CGLibInterceptor.intercept(LazyInitProxyFactory.java:319)
at WICKET_wicketspring.easy.jdbc.JdbcWicketSpringHandler$$EnhancerByCGLIB$$e8f0e174.data(<generated>)
at wicketspring.easy.HomePage.<init>(HomePage.java:91)
at wicketspring.easy.HomePage.<init>(HomePage.java:47)
這裏是applicationContext.xml中:使用構造公共wicketspring.easy.HomePage()
根本原因無法實例頁面適用於春季:
<beans>
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
<property name="driverClassName" value="org.apache.derby.jdbc.EmbeddedDriver" />
<property name="url"><value>jdbc:derby:wicketspringdb</value></property>
<property name="username"><value></value></property>
<property name="password"><value></value></property>
</bean>
<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
<property name="dataSource" ref="dataSource" />
</bean>
</beans>
<beans>
<import resource="classpath:common.xml"/>
<bean id="jdbcHandler" class=wicketspring.easy.jdbc.JdbcWicketSpringHandler">
<property name="jdbcTemplate" ref="jdbcTemplate" />
</bean>
</beans>
...
Another stack trace system out.
Page.java:74) - At [2b] -- java.lang.NoClassDefFoundError: Could not initialize class org.apache.derby.jdbc.EmbeddedDriver
java.lang.NoClassDefFoundError: Could not initialize class org.apache.derby.jdbc.EmbeddedDriver
at wicketspring.easy.HomePage.<init>(HomePage.java:72)
at wicketspring.easy.HomePage.<init>(HomePage.java:47)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:
39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorIm
pl.java:27)
...
這裏是java代碼,代碼編譯和我可以打印出類但我不能實例化它。奇怪?
Java代碼:
package wicketspring.easy;
import java.util.List;
import org.apache.wicket.Application;
import org.apache.wicket.PageParameters;
import org.apache.wicket.markup.html.WebPage;
import org.apache.wicket.markup.html.basic.Label;
import org.apache.wicket.markup.html.list.ListItem;
import org.apache.wicket.markup.html.list.ListView;
import org.apache.wicket.model.CompoundPropertyModel;
import org.apache.wicket.proxy.IProxyTargetLocator;
import org.apache.wicket.proxy.LazyInitProxyFactory;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import model.LoadableDetachableList;
import model.SelectionOptionBean;
import wicketspring.easy.jdbc.JdbcWicketSpringHandler;
import wicketspring.easy.service.IStateListService;
import wicketspring.easy.service.StateListServiceImpl;
import org.apache.derby.jdbc.EmbeddedDriver;
public class HomePage extends WebPage {
private final JdbcWicketSpringHandler jdbcWicketSpringHandler;
public HomePage(final PageParameters parameters) {
super(parameters);
jdbcWicketSpringHandler = (JdbcWicketSpringHandler) LazyInitProxyFactory.createProxy(JdbcWicketSpringHandler.class,
new IProxyTargetLocator() {
private static final long serialVersionUID = 1L;
public Object locateProxyTarget() {
return ((WicketApplication) Application.get()).context().getBean("jdbcHandler");
}
});
/// WEIRD BECAUSE IT REACHES THIS POINT!!!
LOGGER.debug("At [1] -- " + EmbeddedDriver.class);
try {
LOGGER.debug("At [2] -- " + new org.apache.derby.jdbc.EmbeddedDriver());
} catch (NoClassDefFoundError ne) {
// STACK TRACE ERROR HERE!!!!
LOGGER.debug("At [2b] -- " + ne);
ne.printStackTrace();
} catch (Exception e) {
LOGGER.debug("At [2] -- " + e);
e.printStackTrace();
}
try {
LOGGER.debug("At -- " + Class.forName("org.apache.derby.jdbc.EmbeddedDriver"));
} catch (NoClassDefFoundError ne) {
LOGGER.debug("At [3b] -- " + ne);
ne.printStackTrace();
} catch (Exception e) {
LOGGER.debug("At [3] -- " + e);
e.printStackTrace();
}
/// ERROR FOR STACKOVERFLOW IS GENERATED FROM THIS LINE!!!!
LOGGER.debug("At HomePage - jdbcHandler [3]: " + jdbcWicketSpringHandler.toStringJdbcTemplate());
LOGGER.debug("At HomePage - jdbcHandler [3]: " + jdbcWicketSpringHandler.data());
...
} // End of Class //
編輯: 我可能會丟失一個jar文件是春天JDBC或二溴氯丙烷的依賴。
這裏是我的WEB-INF/lib目錄列表:
antlr-2.7.6.jar
aopalliance-1.0.jar
avalon-framework-4.1.3.jar
axis-1.4.jar
axis-jaxrpc-1.4.jar
cglib-nodep-2.2.jar
commons-collections-3.1.jar
commons-dbcp-1.2.2.jar
commons-logging-1.1.jar
commons-pool-1.3.jar
derby-10.6.1.0.jar
dom4j-1.6.1.jar
hibernate-core-3.5.1-Final.jar
jetty-6.1.4.jar
jetty-management-6.1.4.jar
jetty-util-6.1.4.jar
jta-1.1.jar
log4j-1.2.14.jar
logkit-1.0.1.jar
mx4j-3.0.1.jar
mx4j-tools-3.0.1.jar
servlet-api-2.5-6.1.4.jar
servlet-api-2.5.jar
slf4j-api-1.5.8.jar
slf4j-log4j12-1.4.2.jar
spring-2.5.6.jar
spring-aop-2.5.6.jar
spring-beans-2.5.6.jar
spring-context-2.5.6.jar
spring-core-2.5.6.jar
spring-jdbc-2.5.6.jar
spring-test-2.5.6.jar
spring-tx-2.5.6.jar
testRunWrapper-1.0.0.jar
wicket-1.4.13.jar
wicket-ioc-1.4.13.jar
wicket-spring-1.4.13.jar
xml-apis-1.0.b2.jar
Eclipse未正確部署項目。看起來像'derby.jar'沒有被部署到正確的位置(或者可能根本就沒有)。在SO上已經有一個'NoClassDefFoundError'和'ClassNotFoundException'的問題。 – 2011-04-08 16:24:59
我使用Eclipse進行開發,但在命令行上使用maven。 Derby包含在目標/ WEB-INF/lib/derby.jar和WebContent/WEB-INF/lib/derby.jar中。我認爲這是彈簧加載豆時更多的問題。 – 2011-04-08 16:26:39