小编Mic*_*Bil的帖子

尝试调用"persist"方法将实体模型保存到Spring MVC Web应用程序中的数据库时,我收到此错误.无法在互联网上找到任何与此特定错误相关的帖子或页面.似乎EntityManagerFactory bean出了问题,但我对Spring编程还是比较新的,所以对我来说似乎所有内容都已经初始化很好并且根据web中的各种教程文章.

调度员servlet.xml中

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc"
 xmlns:context="http://www.springframework.org/schema/context"
 xmlns:jpa="http://www.springframework.org/schema/data/jpa"
xsi:schemaLocation="
 http://www.springframework.org/schema/mvc 
 http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
 http://www.springframework.org/schema/beans 
 http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
 http://www.springframework.org/schema/context 
  http://www.springframework.org/schema/context/spring-context-4.0.xsd
  http://www.springframework.org/schema/jdbc
  http://www.springframework.org/schema/jdbc/spring-jdbc-3.2.xsd
  http://www.springframework.org/schema/data/jpa
  http://www.springframework.org/schema/data/jpa/spring-jpa-1.3.xsd
  http://www.springframework.org/schema/data/repository
  http://www.springframework.org/schema/data/repository/spring-repository-1.5.xsd
  http://www.springframework.org/schema/jee
  http://www.springframework.org/schema/jee/spring-jee-3.2.xsd">

    <context:component-scan base-package="wymysl.Controllers" />
    <jpa:repositories base-package="wymysl.repositories"/> 
    <context:component-scan base-package="wymysl.beans" /> 
    <context:component-scan base-package="wymysl.Validators" /> 
    <bean
     class="org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor" />
     <bean class="org.springframework.orm.hibernate4.HibernateExceptionTranslator"/>

     <bean id="passwordValidator" class="wymysl.Validators.PasswordValidator"></bean>

     <bean id="dataSource"
        class="org.springframework.jdbc.datasource.DriverManagerDataSource">

        <property name="driverClassName" value="oracle.jdbc.driver.OracleDriver" />
        <property name="url" value="jdbc:oracle:thin:@localhost:1521:xe" />
        <property name="username" value="system" />
        <property name="password" value="polskabieda1" />
    </bean>

 <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
    <property name="persistenceXmlLocation" value="classpath:./META-INF/persistence.xml" />
    <property name="dataSource" ref="dataSource" />

    <property …

在浏览器中打开控制器网址时出现此错误。我读到这可能是依赖关系问题，但是每个Springframework jar都具有相同的4.2.0版本，除了cql暂时不使用。

来自服务器的完整跟踪：

HTTP Status 500 - Servlet.init() for servlet dispatcher threw exception

type Exception report

message Servlet.init() for servlet dispatcher threw exception

description The server encountered an internal error that prevented it from fulfilling this request.

exception

javax.servlet.ServletException: Servlet.init() for servlet dispatcher threw exception
    org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
    org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:423)
    org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1079)
    org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:620)
    org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)
    java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    java.lang.Thread.run(Thread.java:745)

root cause

java.lang.NoSuchMethodError: org.springframework.expression.spel.SpelParserConfiguration.<init>(Lorg/springframework/expression/spel/SpelCompilerMode;Ljava/lang/ClassLoader;)V
    org.springframework.context.expression.StandardBeanExpressionResolver.<init>(StandardBeanExpressionResolver.java:98)
    org.springframework.context.support.AbstractApplicationContext.prepareBeanFactory(AbstractApplicationContext.java:620)
    org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:512)
    org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:667)
    org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:633)
    org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:681)
    org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:552)
    org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:493)
    org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:136)
    javax.servlet.GenericServlet.init(GenericServlet.java:158)
    org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
    org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:423)
    org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1079)
    org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:620)
    org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)
    java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) …

在我的 Angular 6 应用程序中，我有一个异步验证器来检查输入的电子邮件是否已经注册，但现在我得到“预期验证器返回 Promise 或 Observable”，我真的不知道为什么。

import { UserService } from '../user/service/user.service';
import { AbstractControl, ValidationErrors, AsyncValidator } from '@angular/forms';
import * as validationUtils from '../validation/validation-utils';
import { Injectable } from '@angular/core';
import { of, Observable } from 'rxjs';
import { map } from 'rxjs/operators';

@Injectable({
  providedIn: 'root'
})
export class EmailExistValidator implements AsyncValidator {
  constructor(private userService: UserService) {
  }

  validate(emailControl: AbstractControl): Promise<ValidationErrors | null> | Observable<ValidationErrors | null> {
    const email = emailControl.value;

    if (new RegExp(validationUtils.emailRegex).test(email)) {
      this.userService …

当我尝试编译我的单元测试文件时,我得到'未定义的引用`dlsym'错误.我在Unix系统上读到了(我在Ubuntu 12.04上)将-ldl添加到编译器中,但我尝试使用Zed的Shaw Makefile但仍然没有发生任何事情.这是代码:

CFLAGS=-g -O2 -Wall -Wextra -Isrc -rdynamic -DNDEBUG $(OPTFLAGS)
LIBS=-ldl $(OPTLIBS)
PREFIX?=/usr/local

SOURCES=$(wildcard src/**/*.c src/*.c)
OBJECTS=$(patsubst %.c,%.o,$(SOURCES))

TEST_SRC=$(wildcard tests/*_tests.c)
TESTS=$(patsubst %.c,%,$(TEST_SRC))

TARGET=build/libex29.a
SO_TARGET=$(patsubst %.a,%.so,$(TARGET))

# The Target Build
all: $(TARGET) $(SO_TARGET) tests

dev:    CFLAGS=-g -Wall -Isrc -Wall -Wextra $(OPTFLAGS)
dev:    all

$(TARGET): CFLAGS += -fPIC
$(TARGET): build $(OBJECTS)
    ar rcs $@ $(OBJECTS)
    ranlib $@

$(SO_TARGET): $(TARGET) $(OBJECTS)
    $(CC) -shared -o $@ $(OBJECTS)

build:
    @mkdir -p build
    @mkdir -p bin

# The Unit Tests
.PHONY: tests
tests: CFLAGS += …

我正在编写音乐播放器,我不知道在用户释放鼠标按钮后如何编写滑块拖动处理程序来设置值.当我编写简单的MouseDragged方法时,拖动会带来非estetic"倒带"声音,因为每次滑块移动时,mediaplayer都会更改值.播放滑块时,媒体播放器监听器会自动更改值以与轨道持续时间同步.这是我到目前为止所得到的.

ChangeListener<Duration> timeListener =  new ChangeListener<Duration>() {
    @Override
    public void changed(
            ObservableValue<? extends Duration> observableValue,
            Duration duration,
            Duration current) {
        durSlider
                .setValue(current
                        .toSeconds());
    }
};

durSlider.setOnMouseDragged(new EventHandler<MouseEvent>() {
            @Override
            public void handle(MouseEvent mouseEvent) {

                    mediaPlayer.seek(Duration.seconds(durSlider.getValue()));

                    }

                });

After running AngularJS app in by NetBeans error mentioned in title appears. I can't see any points where stack is overloaded, as you see I only initialize two variables for login form handling (i'm at the start of my AngularJS adventure). Can it be some hardware issue or I'm making some unconscious mistake here?

error :

RangeError: Maximum call stack size exceeded
    at c (public_html/bower_components/angular/angular.min.js:115:232)
    at http://localhost:8383/LoginJS/bower_components/angular/angular.min.js:115:506
    at q (public_html/bower_components/angular/angular.min.js:7:355)
    at Object.error (public_html/bower_components/angular/angular.min.js:115:475)
    at http://localhost:8383/LoginJS/bower_components/angular/angular.min.js:89:12
    at ra (public_html/bower_components/angular/angular.min.js:69:475)
    at xa …

我的代码中有以下方法。如您所见，它包含用于检查用户名是否已存在于数据库中的嵌套映射。我想以更优雅的方式写它，但我不知道如何。有什么建议？

   @Override
    public Mono<User> registerUser(User user) {

      return emailExists(user.getEmail())
                .flatMap(emailExists -> {
                    if(emailExists) {
                        return Mono.error(new EmailExistsException(
                                "There is an account with that email address: "
                                        + user.getEmail() ));
                    } else {
                        return usernameExists(user.getUsername())
                                .flatMap(usernameExists -> {
                                    if(usernameExists) {
                                        return Mono.error(new UsernameExistsException(
                                                "There is an account with that username: "
                                                        + user.getUsername() ));
                                    } else {
                                        return userRepository.save(user);
                                    }
                                });
                    }
                })

    }