在Netbeans内调试并部署到Netbean的Tomcat服务器的Jersey / Spring应用程序将其应用程序上下文加载两次。它被加载，卸载并再次加载。
血腥为什么？！？！
编辑：看起来如果我在web.xml中注释掉servlet和servlet-mapping，应用程序上下文仍然会加载两次！如果我删除了/conf/web.xml文件，它将被加载两次STILL。 @@＃$ @！ Netbeans的/ Tomcat的
的web.xml：
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
<servlet>
<servlet-name>ServletAdaptor</servlet-name>
<servlet-class>com.sun.jersey.spi.spring.container.servlet.SpringServlet</servlet-class>
<init-param>
<param-name>com.sun.jersey.spi.container.ContainerRequestFilters</param-name>
<param-value>com.sun.jersey.api.container.filter.PostReplaceFilter</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>ServletAdaptor</servlet-name>
<url-pattern>/*</url-pattern>
</servlet-mapping>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<listener>
<listener-class>org.springframework.web.context.request.RequestContextListener</listener-class>
</listener>
<session-config>
<session-timeout>
30
</session-timeout>
</session-config>
</web-app>
Tomcat输出：
Using CATALINA_BASE: "C:\Users\adubi_000\AppData\Roaming\NetBeans\7.2\apache-tomcat-7.0.27.0_base"
Using CATALINA_HOME: "C:\Program Files\Apache Software Foundation\Apache Tomcat 7.0.27"
Using CATALINA_TMPDIR: "C:\Users\adubi_000\AppData\Roaming\NetBeans\7.2\apache-tomcat-7.0.27.0_base\temp"
Using JRE_HOME: "C:\Program Files\Java\jdk1.7.0_07"
Using CLASSPATH: "C:\Program Files\Apache Software Foundation\Apache Tomcat 7.0.27\bin\bootstrap.jar;C:\Program Files\Apache Software Foundation\Apache Tomcat 7.0.27\bin\tomcat-juli.jar"
Listening for transport dt_shmem at address: tomcat_shared_memory_id
Sep 15, 2012 9:19:22 PM org.apache.catalina.core.AprLifecycleListener init
INFO: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path:
Sep 15, 2012 9:19:22 PM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["http-bio-80"]
Sep 15, 2012 9:19:22 PM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["ajp-bio-8009"]
Sep 15, 2012 9:19:22 PM org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 821 ms
Sep 15, 2012 9:19:22 PM org.apache.catalina.core.StandardService startInternal
INFO: Starting service Catalina
Sep 15, 2012 9:19:22 PM org.apache.catalina.core.StandardEngine startInternal
INFO: Starting Servlet Engine: Apache Tomcat/7.0.27
Sep 15, 2012 9:19:22 PM org.apache.catalina.startup.HostConfig deployDescriptor
INFO: Deploying configuration descriptor C:\Users\adubi_000\AppData\Roaming\NetBeans\7.2\apache-tomcat-7.0.27.0_base\conf\Catalina\localhost\manager.xml
Sep 15, 2012 9:19:23 PM org.apache.catalina.startup.HostConfig deployDescriptor
INFO: Deploying configuration descriptor C:\Users\adubi_000\AppData\Roaming\NetBeans\7.2\apache-tomcat-7.0.27.0_base\conf\Catalina\localhost\ROOT.xml
Sep 15, 2012 9:19:26 PM org.springframework.web.context.ContextLoader initWebApplicationContext
INFO: Root WebApplicationContext: initialization started
Sep 15, 2012 9:19:26 PM org.springframework.context.support.AbstractApplicationContext prepareRefresh
INFO: Refreshing Root WebApplicationContext: startup date [Sat Sep 15 21:19:26 EST 2012]; root of context hierarchy
Sep 15, 2012 9:19:26 PM org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
INFO: Loading XML bean definitions from ServletContext resource [/WEB-INF/applicationContext.xml]
Sep 15, 2012 9:19:27 PM org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletons
INFO: Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@2829abfd: defining beans [...]; root of factory hierarchy
Sep 15, 2012 9:19:28 PM org.hibernate.annotations.common.Version <clinit>
INFO: HCANN000001: Hibernate Commons Annotations {4.0.1.Final}
Sep 15, 2012 9:19:28 PM org.hibernate.Version logVersion
INFO: HHH000412: Hibernate Core {4.1.6.Final}
Sep 15, 2012 9:19:28 PM org.hibernate.cfg.Environment <clinit>
INFO: HHH000206: hibernate.properties not found
Sep 15, 2012 9:19:28 PM org.hibernate.cfg.Environment buildBytecodeProvider
INFO: HHH000021: Bytecode provider name : javassist
Sep 15, 2012 9:19:28 PM org.hibernate.service.jdbc.connections.internal.ConnectionProviderInitiator instantiateExplicitConnectionProvider
INFO: HHH000130: Instantiating explicit connection provider: org.hibernate.service.jdbc.connections.internal.C3P0ConnectionProvider
Sep 15, 2012 9:19:28 PM org.hibernate.service.jdbc.connections.internal.C3P0ConnectionProvider configure
INFO: HHH010002: C3P0 using driver: com.mysql.jdbc.Driver at URL: jdbc:mysql://127.0.0.1:3306/...
Sep 15, 2012 9:19:28 PM org.hibernate.service.jdbc.connections.internal.C3P0ConnectionProvider configure
INFO: HHH000046: Connection properties: {user=root, autocommit=true, release_mode=auto}
Sep 15, 2012 9:19:28 PM org.hibernate.service.jdbc.connections.internal.C3P0ConnectionProvider configure
INFO: HHH000006: Autocommit mode: true
Sep 15, 2012 9:19:28 PM com.mchange.v2.log.MLog <clinit>
INFO: MLog clients using java 1.4+ standard logging.
Sep 15, 2012 9:19:28 PM com.mchange.v2.c3p0.C3P0Registry banner
INFO: Initializing c3p0-0.9.1 [built 16-January-2007 14:46:42; debug? true; trace: 10]
Sep 15, 2012 9:19:29 PM com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource getPoolManager
INFO: Initializing c3p0 pool...
Sep 15, 2012 9:19:29 PM org.hibernate.dialect.Dialect <init>
INFO: HHH000400: Using dialect: org.hibernate.dialect.MySQL5InnoDBDialect
Sep 15, 2012 9:19:29 PM org.hibernate.engine.jdbc.internal.LobCreatorBuilder useContextualLobCreation
INFO: HHH000424: Disabling contextual LOB creation as createClob() method threw error : java.lang.reflect.InvocationTargetException
Sep 15, 2012 9:19:29 PM org.hibernate.engine.transaction.internal.TransactionFactoryInitiator initiateService
INFO: HHH000268: Transaction strategy: org.hibernate.engine.transaction.internal.jdbc.JdbcTransactionFactory
Sep 15, 2012 9:19:29 PM org.hibernate.hql.internal.ast.ASTQueryTranslatorFactory <init>
INFO: HHH000397: Using ASTQueryTranslatorFactory
Sep 15, 2012 9:19:29 PM org.hibernate.tool.hbm2ddl.SchemaUpdate execute
INFO: HHH000228: Running hbm2ddl schema update
...
Sep 15, 2012 9:19:31 PM org.springframework.web.context.ContextLoader initWebApplicationContext
INFO: Root WebApplicationContext: initialization completed in 4806 ms
Sep 15, 2012 9:19:31 PM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["http-bio-80"]
Sep 15, 2012 9:19:31 PM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["ajp-bio-8009"]
Sep 15, 2012 9:19:31 PM org.apache.catalina.startup.Catalina start
INFO: Server startup in 8866 ms
Sep 15, 2012 9:19:31 PM com.sun.jersey.spi.spring.container.servlet.SpringServlet getContext
INFO: Using default applicationContext
Sep 15, 2012 9:19:31 PM com.sun.jersey.spi.spring.container.SpringComponentProviderFactory registerSpringBeans
INFO: Registering Spring bean, ...
Sep 15, 2012 9:19:31 PM com.sun.jersey.server.impl.application.WebApplicationImpl _initiate
INFO: Initiating Jersey application, version 'Jersey: 1.13 06/29/2012 05:14 PM'
Sep 15, 2012 9:19:32 PM org.springframework.context.support.AbstractApplicationContext doClose
INFO: Closing Root WebApplicationContext: startup date [Sat Sep 15 21:19:26 EST 2012]; root of context hierarchy
Sep 15, 2012 9:19:32 PM org.springframework.beans.factory.support.DefaultSingletonBeanRegistry destroySingletons
INFO: Destroying singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@2829abfd: defining beans [...]; root of factory hierarchy
Sep 15, 2012 9:19:32 PM org.apache.catalina.loader.WebappClassLoader clearReferencesJdbc
SEVERE: The web application [] registered the JDBC driver [com.mysql.jdbc.Driver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered.
Sep 15, 2012 9:19:32 PM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
SEVERE: The web application [] appears to have started a thread named [Abandoned connection cleanup thread] but has failed to stop it. This is very likely to create a memory leak.
Sep 15, 2012 9:19:32 PM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
SEVERE: The web application [] appears to have started a thread named [java-sdk-http-connection-reaper] but has failed to stop it. This is very likely to create a memory leak.
Sep 15, 2012 9:19:32 PM org.apache.catalina.loader.WebappClassLoader checkThreadLocalMapForLeaks
SEVERE: The web application [] created a ThreadLocal with key of type [com.sun.xml.bind.v2.ClassFactory$1] (value [com.sun.xml.bind.v2.ClassFactory$1@911a094]) and a value of type [java.util.WeakHashMap] (value [{class javax.xml.bind.annotation.W3CDomHandler=java.lang.ref.WeakReference@64455932}]) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.
Sep 15, 2012 9:19:33 PM org.apache.catalina.startup.HostConfig checkResources
INFO: Undeploying context []
Sep 15, 2012 9:19:33 PM org.apache.catalina.startup.HostConfig deployDescriptor
INFO: Deploying configuration descriptor C:\Users\adubi_000\AppData\Roaming\NetBeans\7.2\apache-tomcat-7.0.27.0_base\conf\Catalina\localhost\ROOT.xml
Sep 15, 2012 9:19:36 PM org.springframework.web.context.ContextLoader initWebApplicationContext
INFO: Root WebApplicationContext: initialization started
Sep 15, 2012 9:19:36 PM org.springframework.context.support.AbstractApplicationContext prepareRefresh
INFO: Refreshing Root WebApplicationContext: startup date [Sat Sep 15 21:19:36 EST 2012]; root of context hierarchy
Sep 15, 2012 9:19:36 PM org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
INFO: Loading XML bean definitions from ServletContext resource [/WEB-INF/applicationContext.xml]
Sep 15, 2012 9:19:37 PM org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletons
INFO: Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@6b63d42f: defining beans [...]; root of factory hierarchy
Sep 15, 2012 9:19:37 PM org.hibernate.annotations.common.Version <clinit>
INFO: HCANN000001: Hibernate Commons Annotations {4.0.1.Final}
Sep 15, 2012 9:19:37 PM org.hibernate.Version logVersion
INFO: HHH000412: Hibernate Core {4.1.6.Final}
Sep 15, 2012 9:19:37 PM org.hibernate.cfg.Environment <clinit>
INFO: HHH000206: hibernate.properties not found
Sep 15, 2012 9:19:37 PM org.hibernate.cfg.Environment buildBytecodeProvider
INFO: HHH000021: Bytecode provider name : javassist
Sep 15, 2012 9:19:38 PM org.hibernate.service.jdbc.connections.internal.ConnectionProviderInitiator instantiateExplicitConnectionProvider
INFO: HHH000130: Instantiating explicit connection provider: org.hibernate.service.jdbc.connections.internal.C3P0ConnectionProvider
Sep 15, 2012 9:19:38 PM org.hibernate.service.jdbc.connections.internal.C3P0ConnectionProvider configure
INFO: HHH010002: C3P0 using driver: com.mysql.jdbc.Driver at URL: jdbc:mysql://127.0.0.1:3306/....
Sep 15, 2012 9:19:38 PM org.hibernate.service.jdbc.connections.internal.C3P0ConnectionProvider configure
INFO: HHH000046: Connection properties: {user=root, autocommit=true, release_mode=auto}
Sep 15, 2012 9:19:38 PM org.hibernate.service.jdbc.connections.internal.C3P0ConnectionProvider configure
INFO: HHH000006: Autocommit mode: true
Sep 15, 2012 9:19:38 PM com.mchange.v2.log.MLog <clinit>
INFO: MLog clients using java 1.4+ standard logging.
Sep 15, 2012 9:19:38 PM com.mchange.v2.c3p0.C3P0Registry banner
INFO: Initializing c3p0-0.9.1 [built 16-January-2007 14:46:42; debug? true; trace: 10]
Sep 15, 2012 9:19:38 PM com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource getPoolManager
INFO: Initializing c3p0 pool...
Sep 15, 2012 9:19:38 PM org.hibernate.dialect.Dialect <init>
INFO: HHH000400: Using dialect: org.hibernate.dialect.MySQL5InnoDBDialect
Sep 15, 2012 9:19:38 PM org.hibernate.engine.jdbc.internal.LobCreatorBuilder useContextualLobCreation
INFO: HHH000424: Disabling contextual LOB creation as createClob() method threw error : java.lang.reflect.InvocationTargetException
Sep 15, 2012 9:19:38 PM org.hibernate.engine.transaction.internal.TransactionFactoryInitiator initiateService
INFO: HHH000268: Transaction strategy: org.hibernate.engine.transaction.internal.jdbc.JdbcTransactionFactory
Sep 15, 2012 9:19:38 PM org.hibernate.hql.internal.ast.ASTQueryTranslatorFactory <init>
INFO: HHH000397: Using ASTQueryTranslatorFactory
Sep 15, 2012 9:19:39 PM org.hibernate.tool.hbm2ddl.SchemaUpdate execute
INFO: HHH000228: Running hbm2ddl schema update
...
Sep 15, 2012 9:19:40 PM org.springframework.web.context.ContextLoader initWebApplicationContext
INFO: Root WebApplicationContext: initialization completed in 4264 ms
Sep 15, 2012 9:19:40 PM org.apache.catalina.util.LifecycleBase start
INFO: The start() method was called on component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[]] after start() had already been called. The second call will be ignored.
Sep 15, 2012 9:19:41 PM com.sun.jersey.spi.spring.container.servlet.SpringServlet getContext
INFO: Using default applicationContext
Sep 15, 2012 9:19:41 PM com.sun.jersey.spi.spring.container.SpringComponentProviderFactory registerSpringBeans
INFO: Registering Spring bean, ...
Sep 15, 2012 9:19:41 PM com.sun.jersey.server.impl.application.WebApplicationImpl _initiate
INFO: Initiating Jersey application, version 'Jersey: 1.13 06/29/2012 05:14 PM'
答案 0 :(得分：2)
这是Netbean的maven部署插件的工作，它等待tomcat启动（并按照Netbeans-generared ROOT.xml中的指定加载应用程序），然后告诉它重新加载它（来自不同的临时XML）。
解决方法是编辑％CATALINA_BASE％/ conf / tomcat-users.xml并更改用户'ide'的密码（netbeans控制tomcat的密码）。 Tomcat仍然可以正常加载，但部署在保存和其他功能可能无法正常工作。
我会尝试查看netbeans的源代码，看看是否有更好的解决方案。部署插件的这种行为只是很奇怪。当然它可以启动Tomcat为空，然后在第二步中加载应用程序。