【发布时间】：2014-11-27 06:59:51
【问题描述】：
我正在尝试使用多个uis - vaadin、jsp 等实现一个应用程序。
它使用简单的jsp，但后来我决定使用 vaadin 作为 ui。
我创建了 vaadin servlet（还有 spring servlet）。
我的web.xml 看起来像这样
<?xml version="1.0"?>
<web-app 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_2_5.xsd"
version="2.5">
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>
classpath:/pmc-web-context.xml
</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<servlet>
<servlet-name>another-pmc-servlet</servlet-name>
<servlet-class>com.vaadin.server.VaadinServlet</servlet-class>
<init-param>
<param-name>UI</param-name>
<param-value>com.xxxx.app.pmc.vaadin.PmcUi</param-value>
</init-param>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value></param-value>
</init-param>
</servlet>
<servlet>
<servlet-name>pmc-servlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value></param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>another-pmc-servlet</servlet-name>
<url-pattern>/VAADIN/*</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>pmc-servlet</servlet-name>
<url-pattern>/JSP/*</url-pattern>
</servlet-mapping>
<servlet>
<servlet-name>jsp</servlet-name>
<servlet-class>org.apache.jasper.servlet.JspServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>jsp</servlet-name>
<url-pattern>/WEB-INF/jsp/*</url-pattern>
</servlet-mapping>
</web-app>
我创建了 vaadin table 组件并根据我的需要对其进行了调整。我使用自动装配服务。
package com.xxxx.app.pmc.vaadin.components;
import com.xxxx.app.pmc.model.Project;
import com.xxxx.app.pmc.service.project.ProjectService;
import com.vaadin.data.util.IndexedContainer;
import com.vaadin.ui.Table;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import java.util.List;
@Component("projectTable")
public class ProjectTable extends Table {
private static final String CAPTION = "Projects";
private static final String[] headers = { "Project name", "Project owner", "ID" };
@Autowired
private ProjectService projectService;
public Table createTable() {
this.setContainerDataSource(projectDatasource());
this.setVisibleColumns(headers);
this.setSelectable(true);
this.setImmediate(true);
return this;
}
public IndexedContainer projectDatasource() {
IndexedContainer indexedContainer = new IndexedContainer();
for(String header: headers) {
indexedContainer.addContainerProperty(header, String.class, "");
}
List<Project> projects = projectService.findAllProjects();
for(int i = 0; i < projects.size(); i++) {
Object id = indexedContainer.addItem();
Project item = projects.get(i);
indexedContainer.getContainerProperty(id, headers[0]).setValue(item.getProjectName());
indexedContainer.getContainerProperty(id, headers[1]).setValue(item.getProjectOwner());
indexedContainer.getContainerProperty(id, headers[1]).setValue(item.getProjectId());
}
return indexedContainer;
}
}
ProjectService 也是春豆。
@Service("projectService")
public class ProjectService {
@Autowired
private ProjectRepository projectRepository;
public void insertProject(Project project) {
projectRepository.store(project);
}
public List<Project> findAllProjects() {
return projectRepository.getAllItems();
}
public Project getProject(String id) {
return projectRepository.get(id);
}
}
ProjectRepository 是另一个spring bean。它使用来自 MyBatis 的 SqlSessionTemplate bean。
@Repository("projectRepository")
public class ProjectRepository implements IRepository<Project> {
private static final String STORE_PROJECT = "Project.insertProject";
private static final String GET_PROJECT_BY_ID = "Project.getProjectById";
private static final String GET_PROJECT_LIST = "Project.getProjectList";
@Autowired
private SqlSessionTemplate sqlSessionTemplate;
@Override
public void store(Project object) {
sqlSessionTemplate.insert(STORE_PROJECT, object);
}
@Override
public Project get(String id) {
return sqlSessionTemplate.selectOne(GET_PROJECT_BY_ID, id);
}
@Override
public List<Project> getAllItems() {
return sqlSessionTemplate.selectList(GET_PROJECT_LIST);
}
}
当我使用 spring controller（使用 JSP）编写应用程序时，它运行良好。
但是当我添加 vaadin - JSP 停止工作并且 vaadin 应用程序为 ProjectService、ProjectRepository 抛出 NullPointerException... 我使用的所有 bean。
有什么问题？
我所有的上下文xml 上下文文件都很简单。
<import resource="classpath:com/xxxx/app/pmc/pmc-service-context.xml"/>
<context:component-scan base-package="com.xxx.app.pmc"/>
我的pmc-web-context.xml 也有这行。
<mvc:annotation-driven/>
<context:annotation-config/>
它在 JSP 上运行良好，所以我认为问题不在于 spring 声明本身，而是将 spring 集成到我的 vaadin 中。
如何解决？
例如，当我手动创建ProjectTable 对象时，它会为ProjectService 抛出NullPointerException。当我手动创建ProjectService 时，它会为ProjectRepository 抛出NullPointerException 等等。似乎自动装配根本不起作用。
P.S 忘记添加我的 UI 代码
package com.xxxx.app.pmc.vaadin;
import com.xxxx.app.pmc.vaadin.components.ProjectTable;
import com.vaadin.annotations.Title;
import com.vaadin.server.VaadinRequest;
import com.vaadin.ui.UI;
import com.vaadin.ui.VerticalLayout;
import org.springframework.stereotype.Component;
@Title("PMC")
@Component("pmcVaadin")
public class PmcUi extends UI {
@Override
protected void init(VaadinRequest request) {
VerticalLayout mainLayout = new VerticalLayout();
ProjectTable projectTable = new ProjectTable();
mainLayout.addComponent(projectTable.createTable());
mainLayout.setSizeFull();
setContent(mainLayout);
}
}
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标签： java spring servlets vaadin