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在tomcat初始化启动时,配置为:
webapp/WEB-INF/web.xml
在 contextConfigLocation
中导入 yummy-servlet.xml
(虽然我'我知道这不是必需的,因为 servlet-name 是 yummy 它将尝试默认加载 yummy-servlet.xml
)
webapp/WEB-INF/yummy-servlet.xml
导入 spring/applicationContext-hibernate.xml
文件
导入 applicationContext-dataSource.xml
文件的 webapp/WEB-INF/spring/applicationContext-hibernate.xml
webapp/WEB-INF/spring/applicationContext-dataSource.xml
我收到有关无法从相对位置导入 bean 定义的错误,但堆栈跟踪不是很明确地说明问题的确切什么,我从昨天开始就一直在研究这些问题我真的没有看到文件有任何问题
我的 web.xml:
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
<display-name>hello-spring3-RC1</display-name>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/yummy-servlet.xml</param-value>
</context-param>
<!--
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/spring/applicationContext-hibernate.xml</param-value>
</context-param>
-->
<!--
Location of the Log4J config file, for initialization and refresh checks.
Applied by Log4jConfigListener.
-->
<context-param>
<param-name>log4jConfigLocation</param-name>
<param-value>classpath:log4j.properties</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<servlet>
<servlet-name>yummy</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>yummy</servlet-name>
<url-pattern>*.html</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
</welcome-file-list>
</web-app>
我的 yummy-servlet.xml:
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd">
<import resource="spring/applicationContext-hibernate.xml"/>
<context:component-scan base-package="com.mine.web.controllers"/>
<bean id="jspViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
<property name="prefix" value="/WEB-INF/jsp/"/>
<property name="suffix" value=".jsp"/>
</bean>
</beans>
我的 applicationContext-hibernate.xml:
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:p="http://www.springframework.org/schema/p" xmlns:context="http://www.springframework.org/schema/context"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd">
<!-- import the dataSource definition -->
<import resource="applicationContext-dataSource.xml"/>
<!-- Configurer that replaces ${...} placeholders with values from a properties file -->
<!-- (in this case, Hibernate-related settings for the sessionFactory definition below) -->
<context:property-placeholder location="classpath:jdbc.properties"/>
<context:property-placeholder location="classpath:hibernate.properties"/>
<!-- Hibernate SessionFactory -->
<bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean"
p:dataSource-ref="dataSource" p:mappingResources="hello.hbm.xml">
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">${hibernate.dialect}</prop>
<prop key="hibernate.show_sql">${hibernate.show_sql}</prop>
<prop key="hibernate.generate_statistics">${hibernate.generate_statistics}</prop>
</props>
</property>
<property name="eventListeners">
<map>
<entry key="merge">
<bean class="org.springframework.orm.hibernate3.support.IdTransferringMergeEventListener"/>
</entry>
</map>
</property>
</bean>
<bean id="hibernateTemplate" class="org.springframework.orm.hibernate3.HibernateTemplate">
<property name="sessionFactory" ref="sessionFactory" />
</bean>
<!-- Transaction manager for a single Hibernate SessionFactory (alternative to JTA) -->
<bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager"
p:sessionFactory-ref="sessionFactory"/>
<!-- ========================= BUSINESS OBJECT DEFINITIONS ========================= -->
<!--
Activates various annotations to be detected in bean classes:
Spring's @Required and @Autowired, as well as JSR 250's @Resource.
-->
<context:annotation-config/>
<!--
Instruct Spring to perform declarative transaction management
automatically on annotated classes.
-->
<tx:annotation-driven transaction-manager="transactionManager"/>
<bean id="EntityManager" class="com.mine.persistence.hibernate.HibernateHelloWorldDao"/>
</beans>
和我的 applicationContext-dataSource.xml:
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:jdbc="http://www.springframework.org/schema/jdbc"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc.xsd">
<!-- Configurer that replaces ${...} placeholders with values from a properties file -->
<!-- (in this case, JDBC-related settings for the dataSource definition below) -->
<context:property-placeholder location="classpath:jdbc.properties"/>
<context:property-placeholder location="classpath:hibernate.properties"/>
<!--
data source using apache common dbcp pool manager
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close"
p:driverClassName="${jdbc.driverClassName}" p:url="${jdbc.url}"
p:username="${jdbc.username}" p:password="${jdbc.password}"/>-->
<!-- c3p0 pool manager data source -->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close">
<property name="driverClass" value="${jdbc.driverClassName}"/>
<property name="jdbcUrl" value="${jdbc.url}"/>
<property name="user" value="${jdbc.username}"/>
<property name="password" value="${jdbc.password}"/>
<property name="initialPoolSize" value="${hibernate.c3p0.min_size}"/>
<property name="minPoolSize" value="${hibernate.c3p0.min_size}"/>
<property name="maxPoolSize" value="${jdbc.maxconn}"/>
<property name="idleConnectionTestPeriod" value="150"/>
<property name="acquireIncrement" value="1"/>
<property name="maxStatements" value="0"/>
<property name="numHelperThreads" value="5"/>
</bean>
</beans>
这是堆栈跟踪:
2010-06-13 12:16:33,526 INFO [org.springframework.web.context.ContextLoader] - <
Root WebApplicationContext: initialization started>
2010-06-13 12:16:33,707 INFO [org.springframework.web.context.support.XmlWebAppl
icationContext] - <Refreshing Root WebApplicationContext: startup date [Sun Jun
13 12:16:33 GMT-05:00 2010]; root of context hierarchy>
2010-06-13 12:16:34,086 INFO [org.springframework.beans.factory.xml.XmlBeanDefin
itionReader] - <Loading XML bean definitions from ServletContext resource [/WEB-
INF/yummy-servlet.xml]>
2010-06-13 12:16:34,378 INFO [org.springframework.beans.factory.xml.XmlBeanDefin
itionReader] - <Loading XML bean definitions from URL [jndi:/localhost/protoweb/
WEB-INF/spring/applicationContext-hibernate.xml]>
2010-06-13 12:16:34,473 INFO [org.springframework.beans.factory.xml.XmlBeanDefin
itionReader] - <Loading XML bean definitions from URL [jndi:/localhost/protoweb/
WEB-INF/spring/applicationContext-dataSource.xml]>
2010-06-13 12:16:35,098 ERROR [org.springframework.web.context.ContextLoader] -
<Context initialization failed>
org.springframework.beans.factory.parsing.BeanDefinitionParsingException: Configuration problem: Failed to import bean definitions from relative location [spring/applicationContext-hibernate.xml]
Offending resource: ServletContext resource [/WEB-INF/yummy-servlet.xml]; nested
exception is org.springframework.beans.factory.BeanDefinitionStoreException: Un
expected exception parsing XML document from URL [jndi:/localhost/protoweb/WEB-INF/spring/applicationContext-hibernate.xml]; nested exception is java.lang.NoSuchMethodError: org.springframework.beans.MutablePropertyValues.add(Ljava/lang/Str
ing;Ljava/lang/Object;)Lorg/springframework/beans/MutablePropertyValues;
at org.springframework.beans.factory.parsing.FailFastProblemReporter.err
or(FailFastProblemReporter.java:68)
at org.springframework.beans.factory.parsing.ReaderContext.error(ReaderC
ontext.java:85)
at org.springframework.beans.factory.parsing.ReaderContext.error(ReaderC
ontext.java:76)
at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentRe
ader.importBeanDefinitionResource(DefaultBeanDefinitionDocumentReader.java:197)
at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentRe
ader.parseDefaultElement(DefaultBeanDefinitionDocumentReader.java:146)
at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentRe
ader.parseBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:131)
at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentRe
ader.registerBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:91)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.registe
rBeanDefinitions(XmlBeanDefinitionReader.java:475)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadB
eanDefinitions(XmlBeanDefinitionReader.java:372)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBea
nDefinitions(XmlBeanDefinitionReader.java:316)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBea
nDefinitions(XmlBeanDefinitionReader.java:284)
at org.springframework.beans.factory.support.AbstractBeanDefinitionReade
r.loadBeanDefinitions(AbstractBeanDefinitionReader.java:143)
at org.springframework.beans.factory.support.AbstractBeanDefinitionReade
r.loadBeanDefinitions(AbstractBeanDefinitionReader.java:178)
at org.springframework.beans.factory.support.AbstractBeanDefinitionReade
r.loadBeanDefinitions(AbstractBeanDefinitionReader.java:149)
at org.springframework.web.context.support.XmlWebApplicationContext.load
BeanDefinitions(XmlWebApplicationContext.java:125)
at org.springframework.web.context.support.XmlWebApplicationContext.load
BeanDefinitions(XmlWebApplicationContext.java:93)
at org.springframework.context.support.AbstractRefreshableApplicationCon
text.refreshBeanFactory(AbstractRefreshableApplicationContext.java:127)
at org.springframework.context.support.AbstractApplicationContext.obtain
FreshBeanFactory(AbstractApplicationContext.java:429)
at org.springframework.context.support.AbstractApplicationContext.refres
h(AbstractApplicationContext.java:356)
at org.springframework.web.context.ContextLoader.createWebApplicationCon
text(ContextLoader.java:270)
at org.springframework.web.context.ContextLoader.initWebApplicationConte
xt(ContextLoader.java:197)
at org.springframework.web.context.ContextLoaderListener.contextInitiali
zed(ContextLoaderListener.java:47)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContex
t.java:3972)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4
467)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase
.java:791)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:77
1)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:546)
at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:905)
at org.apache.catalina.startup.HostConfig.deployWARs(HostConfig.java:740
)
at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:500
)
at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1277)
at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java
:321)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(Lifecycl
eSupport.java:119)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:785)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443
)
at org.apache.catalina.core.StandardService.start(StandardService.java:5
19)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:710
)
at org.apache.catalina.startup.Catalina.start(Catalina.java:581)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)
Caused by: org.springframework.beans.factory.BeanDefinitionStoreException: Unexp
ected exception parsing XML document from URL [jndi:/localhost/protoweb/WEB-INF/
spring/applicationContext-hibernate.xml]; nested exception is java.lang.NoSuchMe
thodError: org.springframework.beans.MutablePropertyValues.add(Ljava/lang/String
;Ljava/lang/Object;)Lorg/springframework/beans/MutablePropertyValues;
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadB
eanDefinitions(XmlBeanDefinitionReader.java:394)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBea
nDefinitions(XmlBeanDefinitionReader.java:316)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBea
nDefinitions(XmlBeanDefinitionReader.java:284)
at org.springframework.beans.factory.support.AbstractBeanDefinitionReade
r.loadBeanDefinitions(AbstractBeanDefinitionReader.java:143)
at org.springframework.beans.factory.support.AbstractBeanDefinitionReade
r.loadBeanDefinitions(AbstractBeanDefinitionReader.java:178)
at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentRe
ader.importBeanDefinitionResource(DefaultBeanDefinitionDocumentReader.java:187)
... 42 more
Caused by: java.lang.NoSuchMethodError: org.springframework.beans.MutablePropert
yValues.add(Ljava/lang/String;Ljava/lang/Object;)Lorg/springframework/beans/Muta
blePropertyValues;
at org.springframework.transaction.config.AnnotationDrivenBeanDefinition
Parser.registerTransactionManager(AnnotationDrivenBeanDefinitionParser.java:95)
at org.springframework.transaction.config.AnnotationDrivenBeanDefinition
Parser.access$0(AnnotationDrivenBeanDefinitionParser.java:94)
at org.springframework.transaction.config.AnnotationDrivenBeanDefinition
Parser$AopAutoProxyConfigurer.configureAutoProxyCreator(AnnotationDrivenBeanDefi
nitionParser.java:121)
at org.springframework.transaction.config.AnnotationDrivenBeanDefinition
Parser.parse(AnnotationDrivenBeanDefinitionParser.java:79)
at org.springframework.beans.factory.xml.NamespaceHandlerSupport.parse(N
amespaceHandlerSupport.java:72)
at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.pa
rseCustomElement(BeanDefinitionParserDelegate.java:1327)
at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.pa
rseCustomElement(BeanDefinitionParserDelegate.java:1317)
at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentRe
ader.parseBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:134)
at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentRe
ader.registerBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:91)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.registe
rBeanDefinitions(XmlBeanDefinitionReader.java:475)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadB
eanDefinitions(XmlBeanDefinitionReader.java:372)
... 47 more
06/13/2010 12:16:35 PM org.apache.catalina.core.StandardContext start
SEVERE: Error listenerStart
编辑:这是我的 pom.xml:
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.mine</groupId>
<artifactId>protoweb</artifactId>
<packaging>war</packaging>
<version>1.0-SNAPSHOT</version>
<name>protoweb Maven Webapp</name>
<url>http://maven.apache.org</url>
<repositories>
<repository>
<id>springsource maven repo</id>
<url>http://maven.springframework.org/milestone</url>
</repository>
</repositories>
<properties>
<org.springframework.version>3.0.0.RELEASE</org.springframework.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${org.springframework.version}</version>
</dependency>
<!-- required by DAO and transaction management -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>${org.springframework.version}</version>
</dependency>
<!-- required for hibernate orm integration -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-orm</artifactId>
<version>${org.springframework.version}</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<!-- dependencies related with having jsp -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.1.2</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.15</version>
</dependency>
<!-- hibernate3 dependencies -->
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>3.3.2.GA</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-annotations</artifactId>
<version>3.4.0.GA</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-commons-annotations</artifactId>
<version>3.3.0.ga</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-entitymanager</artifactId>
<version>3.4.0.GA</version>
</dependency>
<!-- connection pool manager -->
<dependency>
<groupId>c3p0</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.1</version>
</dependency>
<!-- module for c3p0 and hibernate integration -->
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-c3p0</artifactId>
<version>3.3.2.GA</version>
</dependency>
<!-- open source microsoft sql server driver -->
<dependency>
<groupId>net.sourceforge.jtds</groupId>
<artifactId>jtds</artifactId>
<version>1.2</version>
</dependency>
</dependencies>
<build>
<finalName>protoweb</finalName>
<plugins>
<plugin>
<!-- plugin that allows to deploy the application in tomcat with mvn tomcat:deploy/redeploy -->
<groupId>org.codehaus.mojo</groupId>
<artifactId>tomcat-maven-plugin</artifactId>
<configuration>
<configurationDir>tomcat</configurationDir>
<url>http://localhost:8080/manager</url>
<username>test</username>
<password>test</password>
</configuration>
</plugin>
</plugins>
</build>
</project>
编辑 2:我执行了 mvn clean,然后在执行 mvn tomcat:redeploy 时出现此错误:
[INFO] Preparing tomcat:redeploy
[INFO] [resources:resources]
[WARNING] Using platform encoding (Cp1252 actually) to copy filtered resources, i.e. build
is platform dependent!
[INFO] Copying 5 resources
[WARNING] POM for 'javax.activation:activation:pom:1.1:compile' is invalid.
Its dependencies (if any) will NOT be available to the current build.
[WARNING] POM for 'javax.jms:jms:pom:1.1:compile' is invalid.
Its dependencies (if any) will NOT be available to the current build.
[WARNING] POM for 'com.sun.jdmk:jmxtools:pom:1.2.1:compile' is invalid.
Its dependencies (if any) will NOT be available to the current build.
[WARNING] POM for 'com.sun.jmx:jmxri:pom:1.2.1:compile' is invalid.
Its dependencies (if any) will NOT be available to the current build.
[INFO] [compiler:compile]
[INFO] Compiling 5 source files to C:\Users\mineq\maven_testing\protoweb\target\classes
[INFO] ------------------------------------------------------------------------
[ERROR] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Compilation failure
error: error reading C:\Users\mineq\.m2\repository\javax\activation\activation\1.1\acti
vation-1.1.jar; error in opening zip file
error: error reading C:\Users\mineq\.m2\repository\javax\jms\jms\1.1\jms-1.1.jar; error
in opening zip file
error: error reading C:\Users\mineq\.m2\repository\com\sun\jdmk\jmxtools\1.2.1\jmxtools
-1.2.1.jar; error in opening zip file
error: error reading C:\Users\mineq\.m2\repository\com\sun\jmx\jmxri\1.2.1\jmxri-1.2.1.
jar; error in opening zip file
最佳答案
java.lang.NoSuchMethodError
通常表示版本不兼容。由于 org.springframework.beans.MutablePropert
是在 Spring 3.0 中添加的,您可能混合了 Spring 3.0 和 3.0 之前的 jar。
yValues.add(Ljava/lang/String;Ljava/lang/Object;)Lorg/springframework/beans/Muta
blePropertyValues;
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我正在使用 Oracle ojdbc 12 和 Java 8 处理 Oracle UCP 管理器的问题。当 UCP 池启动失败时,我希望关闭它创建的连接。 当池初始化期间遇到 ORA-02391:超过
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引用这个plunker: https://plnkr.co/edit/GWsbdDWVvBYNMqyxzlLY?p=preview 我在 styles.css 文件和 src/app.ts 文件中指定
为什么我的条形这么细?我尝试将宽度设置为 1,它们变得非常厚。我不知道还能尝试什么。默认厚度为 0.8,这是应该的样子吗? import matplotlib.pyplot as plt import
当我编写时,查询按预期执行: SELECT id, day2.count - day1.count AS diff FROM day1 NATURAL JOIN day2; 但我真正想要的是右连接。当
我有以下时间数据: 0 08/01/16 13:07:46,335437 1 18/02/16 08:40:40,565575 2 14/01/16 22:2
一些背景知识 -我的 NodeJS 服务器在端口 3001 上运行,我的 React 应用程序在端口 3000 上运行。我在 React 应用程序 package.json 中设置了一个代理来代理对端
我面临着一个愚蠢的问题。我试图在我的 Angular 应用程序中延迟加载我的图像,我已经尝试过这个2: 但是他们都设置了 src attr 而不是 data-src,我在这里遗漏了什么吗?保留 d
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