小编dim*_*imi的帖子

我正在尝试将Spring Data REST文档中描述的RepositoryEventHandler添加到下面显示的REST存储库:

@RepositoryRestResource(collectionResourceRel = "agents", path = "/agents")
public interface AgentRepository extends CrudRepository<Agent, Long> {
    // no implementation required; Spring Data will create a concrete Repository
}

我创建了一个AgentEventHandler:

@Component
@RepositoryEventHandler(Agent.class)
public class AgentEventHandler {

    /**
     * Called before {@link Agent} is persisted 
     * 
     * @param agent
     */
    @HandleBeforeSave
    public void handleBeforeSave(Agent agent) {

        System.out.println("Saving Agent " + agent.toString());

    }
}

并在@Configuration组件中声明它:

@Configuration
public class RepositoryConfiguration {

    /**
     * Declare an instance of the {@link AgentEventHandler}
     *
     * …

我最近开始学习Spring Security,今天我踩到了这个基本的(我相信)问题:为什么我不能访问Servlet过滤器中的当前Principal,如下面的类所示:

package com.acme.test;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

import org.springframework.security.core.Authentication;
import org.springframework.security.core.context.SecurityContext;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.stereotype.Component;

@Component
public class TestFilter implements Filter {

    /*
     * (non-Javadoc)
     * 
     * @see javax.servlet.Filter#init(javax.servlet.FilterConfig)
     */
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        // TODO Auto-generated method stub

    }

    /*
     * (non-Javadoc)
     * 
     * @see javax.servlet.Filter#doFilter(javax.servlet.ServletRequest,
     * javax.servlet.ServletResponse, javax.servlet.FilterChain)
     */
    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
            throws IOException, ServletException {

        SecurityContext …

我正在开发一个需要并发的Java守护进程:一个无限循环,它监听作业队列(redis)并将每个作业分配给一个worker.工作人员不一定要返回值.

我发现Executors非常有用,我使用ThreadPoolExecutor来维护许多工作线程.

但是,这些工作者运行的第三方代码需要尽可能隔离,避免共享静态属性.

我的问题:是否有任何Java库/框架提供类似于Executors的功能,例如:

• 工人池
• 自动调整池大小

..但产生进程而不是线程？

将无效的 JSON 发布到 Spring Data REST（版本 2.2.2）资源时，会抛出 HttpMessageNotReadableException 并返回以下 json：

{
    "cause": {
        "cause": {
            "cause": null,
            "message": "Illegal unquoted character ((CTRL-CHAR, code 10)): has to be escaped using backslash to be included in string value\n at [Source: org.apache.catalina.connector.CoyoteInputStream@646d9de6; line: 2, column: 20]"
        },
        "message": "Illegal unquoted character ((CTRL-CHAR, code 10)): has to be escaped using backslash to be included in string value\n at [Source: org.apache.catalina.connector.CoyoteInputStream@646d9de6; line: 2, column: 20] (through reference chain: gr.bytecode.exceptionhandling.domain.Book[\"name\"])"
    },
    "message": "Could not read JSON: …

我正在使用 Spring Boot 1.1.5.RELEASE 构建一个 Web 应用程序，并按照相关 Spring Boot 文档中的描述配置了一个嵌入式 Jetty 。

我想记录所有传入的 HTTP 请求，我能想到的唯一解决方案（在阅读Spring Boot 文档中的“如何配置 Jetty”之后）是引入一个 EmbeddedServletContainerCustomizer：

package com.acme.rest;

import org.eclipse.jetty.server.Handler;
import org.eclipse.jetty.server.NCSARequestLog;
import org.eclipse.jetty.server.Server;
import org.eclipse.jetty.server.handler.DefaultHandler;
import org.eclipse.jetty.server.handler.HandlerCollection;
import org.eclipse.jetty.server.handler.RequestLogHandler;
import org.springframework.boot.context.embedded.ConfigurableEmbeddedServletContainer;
import org.springframework.boot.context.embedded.EmbeddedServletContainerCustomizer;
import org.springframework.boot.context.embedded.jetty.JettyEmbeddedServletContainerFactory;
import org.springframework.boot.context.embedded.jetty.JettyServerCustomizer;
import org.springframework.context.annotation.Bean;
import org.springframework.stereotype.Component;


/**
 * blah blah
 * 
 * @author Dimi
 */
@Component
public class EmbededJettyConfig implements EmbeddedServletContainerCustomizer {

    /*
     * (non-Javadoc)
     * 
     * @see org.springframework.boot.context.embedded.EmbeddedServletContainerCustomizer # customize
     */
    @Override
    public void customize(final …