4
我正在Glassfish 4.0-b87下運行一個簡單的.war文件，該文件是在Eclipse Kepler M6中使用M2E創建的，作爲添加了動態Web模塊方面的簡單項目，使用Oracle Java 7 JDK/JVM。爲什麼在@Singleton上@PostConstruct調用兩次
基本上有一個類，我期望post_construct方法只能被調用一次。但是它被調用了兩次，第一次在應用程序部署時，第一次也是僅在第一次HTTP請求時多了一次。
下面是類（日誌輸出如下）：
package com.example.main;
import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;
import javax.ejb.LocalBean;
import javax.ejb.PostActivate;
import javax.ejb.PrePassivate;
import javax.ejb.Singleton;
import javax.ejb.Startup;
import javax.enterprise.inject.spi.PassivationCapable;
import javax.ws.rs.ApplicationPath;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.core.Application;
@Singleton
@Startup
@LocalBean
@ApplicationPath("/rest")
@Path("/life")
public class Life extends Application implements PassivationCapable {
@PostConstruct
public void post_construct() {
System.out.println("hello world!");
}
@PreDestroy
public void pre_destroy() {
System.out.println("so long and thanks for the fish!");
}
@PrePassivate
public void pre_passivate() {
System.out.println("taking a break");
}
@PostActivate
public void post_activate() {
System.out.println("back from break");
}
@Override
public String getId() {
return "life";
}
@GET
public String greet() {
return "hi";
}
}
日誌輸出是用虛線分開第一HTTP調用和HTTP調用後的部分之前的部分如下：
[2013-05-09T19:42:26.660-1000] [glassfish 4.0] [INFO] [NCLS-DEPLOYMENT-00027] [javax.enterprise.system.tools.deployment.autodeploy] [tid: _ThreadID=59 _ThreadName=AutoDeployer] [timeMillis: 1368164546660] [levelValue: 800] [[
Selecting file /usr/local/glassfish4/glassfish/domains/domain1/autodeploy/singleton.war for autodeployment]]
[2013-05-09T19:42:26.692-1000] [glassfish 4.0] [INFO] [] [javax.enterprise.system.tools.deployment.common] [tid: _ThreadID=59 _ThreadName=AutoDeployer] [timeMillis: 1368164546692] [levelValue: 800] [[
visiting unvisited references]]
[2013-05-09T19:42:26.702-1000] [glassfish 4.0] [INFO] [] [javax.enterprise.system.tools.deployment.common] [tid: _ThreadID=59 _ThreadName=AutoDeployer] [timeMillis: 1368164546702] [levelValue: 800] [[
visiting unvisited references]]
[2013-05-09T19:42:26.706-1000] [glassfish 4.0] [INFO] [] [javax.enterprise.system.tools.deployment.common] [tid: _ThreadID=59 _ThreadName=AutoDeployer] [timeMillis: 1368164546706] [levelValue: 800] [[
visiting unvisited references]]
[2013-05-09T19:42:26.709-1000] [glassfish 4.0] [INFO] [] [javax.enterprise.system.tools.deployment.common] [tid: _ThreadID=59 _ThreadName=AutoDeployer] [timeMillis: 1368164546709] [levelValue: 800] [[
visiting unvisited references]]
[2013-05-09T19:42:26.749-1000] [glassfish 4.0] [INFO] [ejb.portable_jndi_names] [javax.enterprise.system.container.ejb.com.sun.ejb.containers] [tid: _ThreadID=59 _ThreadName=AutoDeployer] [timeMillis: 1368164546749] [levelValue: 800] [[
EJB5181:Portable JNDI names for EJB Life: [java:global/singleton/Life, java:global/singleton/Life!com.example.main.Life]]]
[2013-05-09T19:42:26.959-1000] [glassfish 4.0] [WARNING] [] [org.jboss.weld.Bootstrap] [tid: _ThreadID=59 _ThreadName=AutoDeployer] [timeMillis: 1368164546959] [levelValue: 900] [[
WELD-001473 javax.enterprise.inject.spi.Bean implementation [email protected] declared a normal scope but does not implement javax.enterprise.inject.spi.PassivationCapable. It won't be possible to inject this bean into a bean with passivating scope (@SessionScoped, @ConversationScoped). This can be fixed by assigning the Bean implementation a unique id by implementing the PassivationCapable interface.]]
[2013-05-09T19:42:26.970-1000] [glassfish 4.0] [INFO] [] [] [tid: _ThreadID=59 _ThreadName=Thread-3] [timeMillis: 1368164546970] [levelValue: 800] [[
hello world!]]
[2013-05-09T19:42:26.982-1000] [glassfish 4.0] [INFO] [] [org.glassfish.jersey.servlet.init.JerseyServletContainerInitializer] [tid: _ThreadID=59 _ThreadName=AutoDeployer] [timeMillis: 1368164546982] [levelValue: 800] [[
Registering the Jersey servlet application, named com.example.main.Life, at the servlet mapping /rest/*, with the Application class of the same name.]]
[2013-05-09T19:42:26.988-1000] [glassfish 4.0] [INFO] [AS-WEB-GLUE-00172] [javax.enterprise.web] [tid: _ThreadID=59 _ThreadName=AutoDeployer] [timeMillis: 1368164546988] [levelValue: 800] [[
Loading application [singleton] at [/singleton]]]
[2013-05-09T19:42:27.003-1000] [glassfish 4.0] [INFO] [] [javax.enterprise.system.core] [tid: _ThreadID=59 _ThreadName=AutoDeployer] [timeMillis: 1368164547003] [levelValue: 800] [[
singleton was successfully deployed in 332 milliseconds.]]
[2013-05-09T19:42:27.006-1000] [glassfish 4.0] [INFO] [NCLS-DEPLOYMENT-00035] [javax.enterprise.system.tools.deployment.autodeploy] [tid: _ThreadID=59 _ThreadName=AutoDeployer] [timeMillis: 1368164547006] [levelValue: 800] [[
[AutoDeploy] Successfully autodeployed : /usr/local/glassfish4/glassfish/domains/domain1/autodeploy/singleton.war.]]
------------------------------第一次HTTP通話後----------- -------------------
[2013-05-09T19:42:44.940-1000] [glassfish 4.0] [INFO] [] [] [tid: _ThreadID=21 _ThreadName=Thread-3] [timeMillis: 1368164564940] [levelValue: 800] [[
hello world!]]
[2013-05-09T19:42:44.940-1000] [glassfish 4.0] [INFO] [] [org.glassfish.jersey.server.ApplicationHandler] [tid: _ThreadID=21 _ThreadName=http-listener-1(4)] [timeMillis: 1368164564940] [levelValue: 800] [[
Initiating Jersey application, version Jersey: 2.0-rc2 2013-04-23 12:04:25...]]
[2013-05-09T19:42:44.956-1000] [glassfish 4.0] [INFO] [] [org.glassfish.jersey.gf.ejb.EjbComponentProvider] [tid: _ThreadID=21 _ThreadName=http-listener-1(4)] [timeMillis: 1368164564956] [levelValue: 800] [[
The Jersey EJB interceptor is bound. JAX-RS EJB integration support is enabled.]]
答案已更新。 – necromancer 2013-05-15 08:06:09