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我有一个简单的弹簧启动应用程序，我用它来连接到REST api并查看它的响应。这是一个简单的原型应用程序。然而，我发现了以下错误：Spring Boot类def找不到错误
Exception in thread "main" java.lang.NoClassDefFoundError: [Lcom/crossover/techtrial/java/se/dto/Account;
at com.crossover.techtrial.java.se.TrialApplication.main(TrialApplication.java:25)
Caused by: java.lang.ClassNotFoundException: com.crossover.techtrial.java.se.dto.Account
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 1 more
我不知道为什么会存在的，因为我已经定义的类账户：
import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
@JsonIgnoreProperties(ignoreUnknown = true)
public class Account
{
private String id;
private MonetaryAmount monetaryAmount;
public Account()
{
}
public String getId()
{
return id;
}
public void setId(String id)
{
this.id = id;
}
public MonetaryAmount getMonetaryAmount()
{
return monetaryAmount;
}
public void setMonetaryAmount(MonetaryAmount monetaryAmount)
{
this.monetaryAmount = monetaryAmount;
}
}
我的调用代码：
package com.crossover.techtrial.java.se;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.client.RestTemplate;
import com.crossover.techtrial.java.se.dto.Account;
@SpringBootApplication
public class TrialApplication
{
@Autowired
public static RestTemplate restTemplate;
@Value("${apiforest.baseuri}")
public static String baseURI;
public static void main(String[] args)
{
String url = baseURI + "/paypallets/accounts";
//SpringApplication.run(TrialApplication.class, args);
restTemplate.getForObject(url, Account[].class);
System.out.println(url);
}
}
另一个问题是它没有获取我在application.properties中定义的关键字“apiforest.baseuri”的值。
我application.properties：
spring.jpa.hibernate.ddl-auto=create
spring.datasource.url=jdbc:mysql://localhost:3306/SampleDB
spring.datasource.username=root
spring.datasource.password=admin
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5Dialect
management.port = 9001
apiforest.baseuri = https://api-forest/....
read.timeout = 10000
connect.timeout = 10000
我RestConfig：
package com.crossover.techtrial.java.se.config;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.client.ClientHttpRequestFactory;
import org.springframework.http.client.HttpComponentsClientHttpRequestFactory;
import org.springframework.web.client.RestTemplate;
// To set the configuration parameters like read timeout and connect timeout for Rest Client
@Configuration
public class RestConfig
{
@Bean
public RestTemplate createRestTemplate(final ClientHttpRequestFactory clientHttpRequestFactory)
{
return new RestTemplate(clientHttpRequestFactory);
}
@Bean
public ClientHttpRequestFactory createClientHttpRequestFactory(@Value("${connect.timeout}") final int connectTimeout,
@Value("${read.timeout}") final int readTimeout)
{
HttpComponentsClientHttpRequestFactory factory = new HttpComponentsClientHttpRequestFactory();
factory.setConnectTimeout(connectTimeout);
factory.setReadTimeout(readTimeout);
return factory;
}
}
我的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>com.crossover.techtrial.java.se</groupId>
<artifactId>trial</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>trial</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.4.3.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
任何想法？
编辑：我改变了我的调用代码是什么@Luke建议做这个：
@SpringBootApplication
public class TrialApplication
{
@Value("${apiforest.baseuri}")
public static String baseURI;
public static void main(String[] args)
{
ConfigurableApplicationContext run =
SpringApplication.run(TrialApplication.class, args);
RestTemplate restTemplate = run.getBean(RestTemplate.class);
String url = baseURI + "/paypallets/accounts";
restTemplate.getForObject(url, Account[].class);
System.out.println(url);
}
}
但现在我得到以下例外，其中一人仍然ClassdefNot发现：
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'createRestTemplate' defined in class path resource [com/crossover/techtrial/java/se/config/RestConfig.class]: Unsatisfied dependency expressed through method 'createRestTemplate' parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'createClientHttpRequestFactory' defined in class path resource [com/crossover/techtrial/java/se/config/RestConfig.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.http.client.ClientHttpRequestFactory]: Factory method 'createClientHttpRequestFactory' threw exception; nested exception is java.lang.NoClassDefFoundError: org/apache/http/client/HttpClient
at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:749) ~[spring-beans-4.3.5.RELEASE.jar:4.3.5.RELEASE]
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:467) ~[spring-beans-4.3.5.RELEASE.jar:4.3.5.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1134) ~[spring-beans-4.3.5.RELEASE.jar:4.3.5.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1028) ~[spring-beans-4.3.5.RELEASE.jar:4.3.5.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:513) ~[spring-beans-4.3.5.RELEASE.jar:4.3.5.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483) ~[spring-beans-4.3.5.RELEASE.jar:4.3.5.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.3.5.RELEASE.jar:4.3.5.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.3.5.RELEASE.jar:4.3.5.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.3.5.RELEASE.jar:4.3.5.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) ~[spring-beans-4.3.5.RELEASE.jar:4.3.5.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:759) ~[spring-beans-4.3.5.RELEASE.jar:4.3.5.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:866) ~[spring-context-4.3.5.RELEASE.jar:4.3.5.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:542) ~[spring-context-4.3.5.RELEASE.jar:4.3.5.RELEASE]
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122) ~[spring-boot-1.4.3.RELEASE.jar:1.4.3.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:761) [spring-boot-1.4.3.RELEASE.jar:1.4.3.RELEASE]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:371) [spring-boot-1.4.3.RELEASE.jar:1.4.3.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) [spring-boot-1.4.3.RELEASE.jar:1.4.3.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1186) [spring-boot-1.4.3.RELEASE.jar:1.4.3.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1175) [spring-boot-1.4.3.RELEASE.jar:1.4.3.RELEASE]
at com.crossover.techtrial.java.se.TrialApplication.main(TrialApplication.java:21) [classes/:na]
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'createClientHttpRequestFactory' defined in class path resource [com/crossover/techtrial/java/se/config/RestConfig.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.http.client.ClientHttpRequestFactory]: Factory method 'createClientHttpRequestFactory' threw exception; nested exception is java.lang.NoClassDefFoundError: org/apache/http/client/HttpClient
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:599) ~[spring-beans-4.3.5.RELEASE.jar:4.3.5.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1134) ~[spring-beans-4.3.5.RELEASE.jar:4.3.5.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1028) ~[spring-beans-4.3.5.RELEASE.jar:4.3.5.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:513) ~[spring-beans-4.3.5.RELEASE.jar:4.3.5.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483) ~[spring-beans-4.3.5.RELEASE.jar:4.3.5.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.3.5.RELEASE.jar:4.3.5.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.3.5.RELEASE.jar:4.3.5.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.3.5.RELEASE.jar:4.3.5.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-4.3.5.RELEASE.jar:4.3.5.RELEASE]
at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:207) ~[spring-beans-4.3.5.RELEASE.jar:4.3.5.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1136) ~[spring-beans-4.3.5.RELEASE.jar:4.3.5.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1064) ~[spring-beans-4.3.5.RELEASE.jar:4.3.5.RELEASE]
at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:835) ~[spring-beans-4.3.5.RELEASE.jar:4.3.5.RELEASE]
at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:741) ~[spring-beans-4.3.5.RELEASE.jar:4.3.5.RELEASE]
... 19 common frames omitted
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.http.client.ClientHttpRequestFactory]: Factory method 'createClientHttpRequestFactory' threw exception; nested exception is java.lang.NoClassDefFoundError: org/apache/http/client/HttpClient
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:189) ~[spring-beans-4.3.5.RELEASE.jar:4.3.5.RELEASE]
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:588) ~[spring-beans-4.3.5.RELEASE.jar:4.3.5.RELEASE]
... 32 common frames omitted
Caused by: java.lang.NoClassDefFoundError: org/apache/http/client/HttpClient
at com.crossover.techtrial.java.se.config.RestConfig.createClientHttpRequestFactory(RestConfig.java:25) ~[classes/:na]
at com.crossover.techtrial.java.se.config.RestConfig$$EnhancerBySpringCGLIB$$25eeb443.CGLIB$createClientHttpRequestFactory$1(<generated>) ~[classes/:na]
at com.crossover.techtrial.java.se.config.RestConfig$$EnhancerBySpringCGLIB$$25eeb443$$FastClassBySpringCGLIB$$44b4ec10.invoke(<generated>) ~[classes/:na]
at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:228) ~[spring-core-4.3.5.RELEASE.jar:4.3.5.RELEASE]
at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:356) ~[spring-context-4.3.5.RELEASE.jar:4.3.5.RELEASE]
at com.crossover.techtrial.java.se.config.RestConfig$$EnhancerBySpringCGLIB$$25eeb443.createClientHttpRequestFactory(<generated>) ~[classes/:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_121]
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_121]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_121]
at java.lang.reflect.Method.invoke(Unknown Source) ~[na:1.8.0_121]
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:162) ~[spring-beans-4.3.5.RELEASE.jar:4.3.5.RELEASE]
... 33 common frames omitted
Caused by: java.lang.ClassNotFoundException: org.apache.http.client.HttpClient
at java.net.URLClassLoader.findClass(Unknown Source) ~[na:1.8.0_121]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[na:1.8.0_121]
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) ~[na:1.8.0_121]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[na:1.8.0_121]
... 44 common frames omitted
一个建议首先删除所有内容，并尝试仅使用主类启动简单的Springboot应用程序。你的主类（有'@ SprinBootApplication'）是不正确的。 – pvpkiran
我甚至试过，仍然得到我在编辑中定义的例外。这让我疯狂。我不知道如何解决它。我应该发布一个新问题吗？ – zhaider
尝试添加这对您的POM' org.apache.httpcomponents HttpClient的 ' –
pvpkiran