我的学习项目有下一个问题。我需要在带有 CDI 的简单 servlet 项目中使用 BeansValidation。我希望 bean 验证与使用范围注释注释的 cdi bean 一起工作，但是现在，当我尝试验证这些 bean（即使它们有一些错误）时，验证器声称根本没有错误。
另外，使用 EL 语言将 bean 属性设置为来自请求的值会很好，这似乎适用于具有范围注释的 bean，但它不适用于任何其他 bean。
我认为这是 CDI 代理的一些问题，但我不知道如何解决它。我使用 maven 构建我的应用程序并将其部署在 Jboss 7.1.1.Final 上。
以下是我项目中的所有资源：
带有范围注释的 Bean：
package pl.lab3.bean;
import javax.enterprise.context.RequestScoped;
import javax.inject.Named;
import javax.validation.constraints.Size;
@Named
@RequestScoped
public class Scoped {
@Size(max = 2)
private String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
没有范围注释的 Bean：
package pl.lab3.bean;
import javax.inject.Named;
import javax.validation.constraints.Size;
@Named
public class Data {
@Size(max = 2)
private String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
小服务程序：
package pl.lab3.servlet;
import pl.lab3.bean.Data;
import pl.lab3.bean.Scoped;
import javax.el.ELContext;
import javax.el.ExpressionFactory;
import javax.inject.Inject;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.validation.ConstraintViolation;
import javax.validation.Validator;
import java.io.IOException;
import java.util.Set;
public class ServletDispatcher extends HttpServlet {
@Inject
private Validator validator;
@Inject
private ELContext elContext;
@Inject
private ExpressionFactory expressionFactory;
@Inject
private Scoped scoped;
@Inject
private Data data;
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException,
IOException {
this.request(request, response);
}
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException,
IOException {
this.request(request, response);
}
private void request(HttpServletRequest request, HttpServletResponse response)
throws IOException {
try {
expressionFactory.createValueExpression(elContext, "${scoped.name}", String.class)
.setValue(elContext, "test");
String goodValue = scoped.getName(); //returns test, as expected
//but in debugger it's still null(first screen)
Set<ConstraintViolation<Scoped>> emptySet = validator.validate(scoped); //doesn't work, returns empty set
scoped.setName("test2");
String goodValue2 = scoped.getName(); //obviously works, but still null in debugger(same first screen, just nothing happened)
Set<ConstraintViolation<Scoped>> emptySet2 =
validator.validate(scoped); //doesn't work too, returns empty set
expressionFactory.createValueExpression(elContext, "${data.name}", String.class)
.setValue(elContext, "test");
String badValue = data.getName(); //above doesn't work, and in debugger too(second screen)
Set<ConstraintViolation<Data>> emptySet3 = validator.validate(data); //empty set...
data.setName("test2");
String goodValue3 = data.getName(); //obviously works, and I can see good value in debugger(third screen)
Set<ConstraintViolation<Data>> errors = validator.validate(data); //and here I've got expected error
} catch (Exception e) {
e.printStackTrace();
}
}
}
servlet 代码中提到的调试器的截图：
屏幕1：
屏幕2：
屏幕3：
还有一些（我认为）不太重要的文件：
网页.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>dispatcher</servlet-name>
<servlet-class>pl.lab3.servlet.ServletDispatcher</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>dispatcher</servlet-name>
<url-pattern>/*</url-pattern>
</servlet-mapping>
</web-app>
豆类.xml
<?xml version="1.0"?>
<beans 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://jboss.org/schema/cdi/beans_1_0.xsd">
</beans>
pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<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/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>lab</groupId>
<version>1.0</version>
<artifactId>lab3-validation</artifactId>
<packaging>war</packaging>
<name>lab3-validation</name>
<dependencies>
<dependency>
<groupId>org.jboss.seam.validation</groupId>
<artifactId>seam-validation</artifactId>
<version>3.1.0.Final</version>
</dependency>
<dependency>
<groupId>org.jboss.spec</groupId>
<artifactId>jboss-javaee-web-6.0</artifactId>
<version>3.0.2.Final</version>
<type>pom</type>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.jboss.weld.servlet</groupId>
<artifactId>weld-servlet</artifactId>
<version>2.0.1.Final</version>
</dependency>
</dependencies>
<repositories>
<repository>
<id>JBoss repository</id>
<url>http://repository.jboss.org/nexus/content/groups/public/</url>
</repository>
</repositories>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.0</version>
<configuration>
<source>1.7</source>
<target>1.7</target>
</configuration>
</plugin>
</plugins>
<finalName>validation</finalName>
</build>
</project>