crm开发定制Spring Cloud Feign实战来袭：工程中配置断路器Hystrix报错NoClassDefFoundError：HystrixCommandAspect解决方案

目录

1、Spring Cloud crm开发定制工程中配置断路器Hystrix

在Spring Cloud Feign工程中配置断路器的时候，pom.xml文件已经加入Hystrix相关的jar：

		<dependency>			<groupId>org.springframework.boot</groupId>			<artifactId>spring-boot-starter-actuator</artifactId>		</dependency>		<dependency>			<groupId>org.springframework.cloud</groupId>			<artifactId>spring-cloud-starter-hystrix-dashboard</artifactId>		</dependency>
  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9

Application.java:

@SpringBootApplication@EnableDiscoveryClient@EnableFeignClients@EnableHystrix@EnableHystrixDashboardpublic class Application {	public static void main(String[] args) {		SpringApplication.run(Application.class, args);	}}
  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11

2、当启动的时候，报如下错误 NoClassDefFoundError：

Exception in thread "main" java.lang.NoClassDefFoundError: com/netflix/hystrix/contrib/javanica/aop/aspectj/HystrixCommandAspect	at java.lang.Class.getDeclaredMethods0(Native Method)	at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)	at java.lang.Class.getDeclaredMethods(Class.java:1975)	at org.springframework.util.ReflectionUtils.getDeclaredMethods(ReflectionUtils.java:613)	at org.springframework.util.ReflectionUtils.doWithMethods(ReflectionUtils.java:524)	at org.springframework.util.ReflectionUtils.doWithMethods(ReflectionUtils.java:510)	at org.springframework.util.ReflectionUtils.getUniqueDeclaredMethods(ReflectionUtils.java:570)	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.getTypeForFactoryMethod(AbstractAutowireCapableBeanFactory.java:697)	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.determineTargetType(AbstractAutowireCapableBeanFactory.java:640)	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.predictBeanType(AbstractAutowireCapableBeanFactory.java:609)	at org.springframework.beans.factory.support.AbstractBeanFactory.isFactoryBean(AbstractBeanFactory.java:1484)	at org.springframework.beans.factory.support.DefaultListableBeanFactory.doGetBeanNamesForType(DefaultListableBeanFactory.java:425)	at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeanNamesForType(DefaultListableBeanFactory.java:395)	at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeansOfType(DefaultListableBeanFactory.java:515)	at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeansOfType(DefaultListableBeanFactory.java:508)	at org.springframework.context.support.AbstractApplicationContext.getBeansOfType(AbstractApplicationContext.java:1186)	at org.springframework.boot.SpringApplication.getExitCodeFromMappedException(SpringApplication.java:818)	at org.springframework.boot.SpringApplication.getExitCodeFromException(SpringApplication.java:804)	at org.springframework.boot.SpringApplication.handleExitCode(SpringApplication.java:790)	at org.springframework.boot.SpringApplication.handleRunFailure(SpringApplication.java:744)	at org.springframework.boot.SpringApplication.run(SpringApplication.java:314)	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1118)	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1107)
  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25

可以看出来是找不到HystrixCommandAspec.java这个类，于是在上找到这个源文件：

3、查看源码（切记：一定要学会查看源码）


源码如下：

/** * Copyright 2012 Netflix, Inc. * <p/> * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * <p/> * http://www.apache.org/licenses/LICENSE-2.0 * <p/> * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */package com.netflix.hystrix.contrib.javanica.aop.aspectj;import com.google.common.base.Throwables;import com.google.common.collect.ImmutableMap;import com.netflix.hystrix.HystrixExecutable;import com.netflix.hystrix.contrib.javanica.annotation.HystrixCollapser;import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand;import com.netflix.hystrix.contrib.javanica.collapser.CommandCollapser;import com.netflix.hystrix.contrib.javanica.command.CommandExecutor;import com.netflix.hystrix.contrib.javanica.command.ExecutionType;import com.netflix.hystrix.contrib.javanica.command.GenericHystrixCommandFactory;import com.netflix.hystrix.contrib.javanica.command.MetaHolder;import com.netflix.hystrix.exception.HystrixBadRequestException;import org.apache.commons.lang3.Validate;import org.aspectj.lang.JoinPoint;import org.aspectj.lang.ProceedingJoinPoint;import org.aspectj.lang.annotation.Around;import org.aspectj.lang.annotation.Aspect;import org.aspectj.lang.annotation.Pointcut;import org.aspectj.lang.reflect.MethodSignature;import java.lang.reflect.Method;import java.lang.reflect.ParameterizedType;import java.lang.reflect.Type;import java.util.List;import java.util.Map;import java.util.concurrent.Future;import static com.netflix.hystrix.contrib.javanica.utils.AopUtils.getDeclaredMethod;import static com.netflix.hystrix.contrib.javanica.utils.AopUtils.getMethodFromTarget;import static com.netflix.hystrix.contrib.javanica.utils.EnvUtils.isCompileWeaving;import static com.netflix.hystrix.contrib.javanica.utils.ajc.AjcUtils.getAjcMethodAroundAdvice;/** * AspectJ aspect to process methods which annotated with {@link HystrixCommand} annotation. */@Aspectpublic class HystrixCommandAspect {    private static final Map<HystrixPointcutType, MetaHolderFactory> META_HOLDER_FACTORY_MAP;    static {        META_HOLDER_FACTORY_MAP = ImmutableMap.<HystrixPointcutType, MetaHolderFactory>builder()                .put(HystrixPointcutType.COMMAND, new CommandMetaHolderFactory())                .put(HystrixPointcutType.COLLAPSER, new CollapserMetaHolderFactory())                .build();    }    @Pointcut("@annotation(com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand)")    public void hystrixCommandAnnotationPointcut() {    }    @Pointcut("@annotation(com.netflix.hystrix.contrib.javanica.annotation.HystrixCollapser)")    public void hystrixCollapserAnnotationPointcut() {    }    @Around("hystrixCommandAnnotationPointcut() || hystrixCollapserAnnotationPointcut()")    public Object methodsAnnotatedWithHystrixCommand(final ProceedingJoinPoint joinPoint) throws Throwable {        Method method = getMethodFromTarget(joinPoint);        Validate.notNull(method, "failed to get method from joinPoint: %s", joinPoint);        if (method.isAnnotationPresent(HystrixCommand.class) && method.isAnnotationPresent(HystrixCollapser.class)) {            throw new IllegalStateException("method cannot be annotated with HystrixCommand and HystrixCollapser " +                    "annotations at the same time");        }        MetaHolderFactory metaHolderFactory = META_HOLDER_FACTORY_MAP.get(HystrixPointcutType.of(method));        MetaHolder metaHolder = metaHolderFactory.create(joinPoint);        HystrixExecutable executable;        ExecutionType executionType = metaHolder.isCollapser() ?                metaHolder.getCollapserExecutionType() : metaHolder.getExecutionType();        if (metaHolder.isCollapser()) {            executable = new CommandCollapser(metaHolder);        } else {            executable = GenericHystrixCommandFactory.getInstance().create(metaHolder, null);        }        Object result;        try {            result = CommandExecutor.execute(executable, executionType);        } catch (HystrixBadRequestException e) {            throw e.getCause();        }        return result;    }    /**     * A factory to create MetaHolder depending on {@link HystrixPointcutType}.     */    private static abstract class MetaHolderFactory {        public MetaHolder create(final ProceedingJoinPoint joinPoint) {            Method method = getMethodFromTarget(joinPoint);            Object obj = joinPoint.getTarget();            Object[] args = joinPoint.getArgs();            Object proxy = joinPoint.getThis();            return create(proxy, method, obj, args, joinPoint);        }        public abstract MetaHolder create(Object proxy, Method method, Object obj, Object[] args, final ProceedingJoinPoint joinPoint);        MetaHolder.Builder metaHolderBuilder(Object proxy, Method method, Object obj, Object[] args, final ProceedingJoinPoint joinPoint) {            MetaHolder.Builder builder = MetaHolder.builder()                    .args(args).method(method).obj(obj).proxyObj(proxy)                    .defaultGroupKey(obj.getClass().getSimpleName())                    .joinPoint(joinPoint);            if (isCompileWeaving()) {                builder.ajcMethod(getAjcMethodFromTarget(joinPoint));            }            return builder;        }    }    private static class CollapserMetaHolderFactory extends MetaHolderFactory {        @Override        public MetaHolder create(Object proxy, Method collapserMethod, Object obj, Object[] args, final ProceedingJoinPoint joinPoint) {            HystrixCollapser hystrixCollapser = collapserMethod.getAnnotation(HystrixCollapser.class);            if (collapserMethod.getParameterTypes().length > 1 || collapserMethod.getParameterTypes().length == 0) {                throw new IllegalStateException("Collapser method must have one argument: " + collapserMethod);            }            Method batchCommandMethod = getDeclaredMethod(obj.getClass(), hystrixCollapser.batchMethod(), List.class);            if (batchCommandMethod == null || !batchCommandMethod.getReturnType().equals(List.class)) {                throw new IllegalStateException("required batch method for collapser is absent: "                        + "(java.util.List) " + obj.getClass().getCanonicalName() + "." +                        hystrixCollapser.batchMethod() + "(java.util.List)");            }            if (!collapserMethod.getParameterTypes()[0]                    .equals(getGenericParameter(batchCommandMethod.getGenericParameterTypes()[0]))) {                throw new IllegalStateException("required batch method for collapser is absent, wrong generic type: expected"                        + obj.getClass().getCanonicalName() + "." +                        hystrixCollapser.batchMethod() + "(java.util.List<" + collapserMethod.getParameterTypes()[0] + ">), but it's " +                        getGenericParameter(batchCommandMethod.getGenericParameterTypes()[0]));            }            Class<?> collapserMethodReturnType;            if (Future.class.isAssignableFrom(collapserMethod.getReturnType())) {                collapserMethodReturnType = getGenericParameter(collapserMethod.getGenericReturnType());            } else {                collapserMethodReturnType = collapserMethod.getReturnType();            }            if (!collapserMethodReturnType                    .equals(getGenericParameter(batchCommandMethod.getGenericReturnType()))) {                throw new IllegalStateException("Return type of batch method must be java.util.List parametrized with corresponding type: expected " +                        "(java.util.List<" + collapserMethodReturnType + ">)" + obj.getClass().getCanonicalName() + "." +                        hystrixCollapser.batchMethod() + "(java.util.List<" + collapserMethod.getParameterTypes()[0] + ">), but it's " +                        getGenericParameter(batchCommandMethod.getGenericReturnType()));            }            HystrixCommand hystrixCommand = batchCommandMethod.getAnnotation(HystrixCommand.class);            if (hystrixCommand == null) {                throw new IllegalStateException("batch method must be annotated with HystrixCommand annotation");            }            // method of batch hystrix command must be passed to metaholder because basically collapser doesn't have any actions            // that should be invoked upon intercepted method, its required only for underlying batch command            MetaHolder.Builder builder = MetaHolder.builder()                    .args(args).method(batchCommandMethod).obj(obj).proxyObj(proxy)                    .defaultGroupKey(obj.getClass().getSimpleName())                    .joinPoint(joinPoint);            if (isCompileWeaving()) {                builder.ajcMethod(getAjcMethodAroundAdvice(obj.getClass(), batchCommandMethod.getName(), List.class));            }            builder.hystrixCollapser(hystrixCollapser);            builder.defaultCollapserKey(collapserMethod.getName());            builder.collapserExecutionType(ExecutionType.getExecutionType(collapserMethod.getReturnType()));            builder.defaultCommandKey(batchCommandMethod.getName());            builder.hystrixCommand(hystrixCommand);            builder.executionType(ExecutionType.getExecutionType(batchCommandMethod.getReturnType()));            return builder.build();        }    }    private static class CommandMetaHolderFactory extends MetaHolderFactory {        @Override        public MetaHolder create(Object proxy, Method method, Object obj, Object[] args, final ProceedingJoinPoint joinPoint) {            HystrixCommand hystrixCommand = method.getAnnotation(HystrixCommand.class);            MetaHolder.Builder builder = metaHolderBuilder(proxy, method, obj, args, joinPoint);            builder.defaultCommandKey(method.getName());            builder.hystrixCommand(hystrixCommand);            builder.executionType(ExecutionType.getExecutionType(method.getReturnType()));            return builder.build();        }    }    private static enum HystrixPointcutType {        COMMAND,        COLLAPSER;        static HystrixPointcutType of(Method method) {            return method.isAnnotationPresent(HystrixCommand.class) ? COMMAND : COLLAPSER;        }    }    private static Method getAjcMethodFromTarget(JoinPoint joinPoint) {        return getAjcMethodAroundAdvice(joinPoint.getTarget().getClass(), (MethodSignature) joinPoint.getSignature());    }    private static Class<?> getGenericParameter(Type type) {        Type tType = ((ParameterizedType) type).getActualTypeArguments()[0];        String className = tType.toString().split(" ")[1];        try {            return Class.forName(className);        } catch (ClassNotFoundException e) {            throw Throwables.propagate(e);        }    }}
  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
  • 68
  • 69
  • 70
  • 71
  • 72
  • 73
  • 74
  • 75
  • 76
  • 77
  • 78
  • 79
  • 80
  • 81
  • 82
  • 83
  • 84
  • 85
  • 86
  • 87
  • 88
  • 89
  • 90
  • 91
  • 92
  • 93
  • 94
  • 95
  • 96
  • 97
  • 98
  • 99
  • 100
  • 101
  • 102
  • 103
  • 104
  • 105
  • 106
  • 107
  • 108
  • 109
  • 110
  • 111
  • 112
  • 113
  • 114
  • 115
  • 116
  • 117
  • 118
  • 119
  • 120
  • 121
  • 122
  • 123
  • 124
  • 125
  • 126
  • 127
  • 128
  • 129
  • 130
  • 131
  • 132
  • 133
  • 134
  • 135
  • 136
  • 137
  • 138
  • 139
  • 140
  • 141
  • 142
  • 143
  • 144
  • 145
  • 146
  • 147
  • 148
  • 149
  • 150
  • 151
  • 152
  • 153
  • 154
  • 155
  • 156
  • 157
  • 158
  • 159
  • 160
  • 161
  • 162
  • 163
  • 164
  • 165
  • 166
  • 167
  • 168
  • 169
  • 170
  • 171
  • 172
  • 173
  • 174
  • 175
  • 176
  • 177
  • 178
  • 179
  • 180
  • 181
  • 182
  • 183
  • 184
  • 185
  • 186
  • 187
  • 188
  • 189
  • 190
  • 191
  • 192
  • 193
  • 194
  • 195
  • 196
  • 197
  • 198
  • 199
  • 200
  • 201
  • 202
  • 203
  • 204
  • 205
  • 206
  • 207
  • 208
  • 209
  • 210
  • 211
  • 212
  • 213
  • 214
  • 215
  • 216
  • 217
  • 218
  • 219
  • 220
  • 221
  • 222
  • 223
  • 224
  • 225
  • 226
  • 227
  • 228

https://github.com/dmgcodevil/Hystrix/tree/958ec5d7b4bb967be077a4c2bbcdc71e7a7f5248/hystrix-contrib/hystrix-javanica

4、通过查看源码找到解决方案

上面这个图片看到：

在pom.文件中加入：

	<!-- https://mvnrepository.com/artifact/com.netflix.hystrix/hystrix-javanica -->		<dependency>			<groupId>com.netflix.hystrix</groupId>			<artifactId>hystrix-javanica</artifactId>			<version>1.5.12</version>		</dependency>
  • 1
  • 2
  • 3
  • 4
  • 5
  • 6

问题解决OK！

更多系列文章推荐：

网站建设定制开发 软件系统开发定制 定制软件开发 软件开发定制 定制app开发 app开发定制 app开发定制公司 电商商城定制开发 定制小程序开发 定制开发小程序 客户管理系统开发定制 定制网站 定制开发 crm开发定制 开发公司 小程序开发定制 定制软件 收款定制开发 企业网站定制开发 定制化开发 android系统定制开发 定制小程序开发费用 定制设计 专注app软件定制开发 软件开发定制定制 知名网站建设定制 软件定制开发供应商 应用系统定制开发 软件系统定制开发 企业管理系统定制开发 系统定制开发