Category Archives: JAVA

[Solved] fastjson Error: write javaBean error, fastjson version 1.2.76, class io.undertow.servlet.xx

Error message:

com. alibaba. fastjson. JSONException:

write javaBean error, fastjson version 1.2.76, class io. undertow. servlet. spec.HttpServletResponseImpl, fieldName : 0,

write javaBean error, fastjson version 1.2.76, class io. undertow. server. HttpServerExchange, fieldName : exchange,

UT010034: Stream not in async mode

code:

    @ApiOperation(value = "TEST",notes = "")
    @PostMapping("/abccc")
    @ResponseBody
    public void test( HttpServletResponse response) {
        //service
    }

Solution:

Remove this swagger comment.

@ApiOperation(value = "TEST",notes = "")

Notes of swagger, @ apioperation (value = “interface description”, httpmethod = “interface request method”, response = “interface return parameter type”, notes = “interface release description”);

That’s right!!!!! There are no bugs!!!!!

Complete error reporting information:

2021-09-01 11:14:36.911 [XNIO-1 task-1] ERROR x.x.x.framework.exception.GlobalExceptionHandler - url=http://xxx.x.x.x:xxxxx/shell/abccc,errormsg=com.alibaba.fastjson.JSONException: write javaBean error, fastjson version 1.2.76, class io.undertow.servlet.spec.HttpServletResponseImpl, fieldName : 0, write javaBean error, fastjson version 1.2.76, class io.undertow.server.HttpServerExchange, fieldName : exchange, UT010034: Stream not in async mode
	at com.alibaba.fastjson.serializer.JavaBeanSerializer.write(JavaBeanSerializer.java:544)
	at com.alibaba.fastjson.serializer.JavaBeanSerializer.write(JavaBeanSerializer.java:154)
	at com.alibaba.fastjson.serializer.JSONSerializer.writeWithFieldName(JSONSerializer.java:360)
	at com.alibaba.fastjson.serializer.JSONSerializer.writeWithFieldName(JSONSerializer.java:338)
	at com.alibaba.fastjson.serializer.ObjectArrayCodec.write(ObjectArrayCodec.java:118)
	at com.alibaba.fastjson.serializer.JSONSerializer.write(JSONSerializer.java:312)
	at com.alibaba.fastjson.JSON.toJSONString(JSON.java:793)
	at com.alibaba.fastjson.JSON.toJSONString(JSON.java:731)
	at com.alibaba.fastjson.JSON.toJSONString(JSON.java:688)
	at com.xxxxx.xxxxx.xxxxx.controller.xxxxxController.test(ShellInfoController.java:40)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:190)
	at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138)
	at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:892)
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:797)
	at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1039)
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:942)
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1005)
	at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:908)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:665)
	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:882)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:750)
	at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:74)
	at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:129)
	at org.springframework.boot.actuate.web.trace.servlet.HttpTraceFilter.doFilterInternal(HttpTraceFilter.java:88)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:109)
	at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
	at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
	at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:109)
	at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
	at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
	at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:92)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:109)
	at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
	at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
	at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:93)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:109)
	at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
	at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
	at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.filterAndRecordMetrics(WebMvcMetricsFilter.java:114)
	at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.doFilterInternal(WebMvcMetricsFilter.java:104)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:109)
	at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
	at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:109)
	at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
	at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
	at io.undertow.servlet.handlers.FilterHandler.handleRequest(FilterHandler.java:84)
	at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:62)
	at io.undertow.servlet.handlers.ServletChain$1.handleRequest(ServletChain.java:68)
	at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36)
	at io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:132)
	at io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:57)
	at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
	at io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:46)
	at io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:64)
	at io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:60)
	at io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:77)
	at io.undertow.security.handlers.AbstractSecurityContextAssociationHandler.handleRequest(AbstractSecurityContextAssociationHandler.java:43)
	at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
	at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
	at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:292)
	at io.undertow.servlet.handlers.ServletInitialHandler.access$100(ServletInitialHandler.java:81)
	at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:138)
	at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:135)
	at io.undertow.servlet.core.ServletRequestContextThreadSetupAction$1.call(ServletRequestContextThreadSetupAction.java:48)
	at io.undertow.servlet.core.ContextClassLoaderSetupAction$1.call(ContextClassLoaderSetupAction.java:43)
	at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:272)
	at io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:81)
	at io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:104)
	at io.undertow.server.Connectors.executeRootHandler(Connectors.java:364)
	at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:830)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)
Caused by: com.alibaba.fastjson.JSONException: write javaBean error, fastjson version 1.2.76, class io.undertow.server.HttpServerExchange, fieldName : exchange, UT010034: Stream not in async mode
	at com.alibaba.fastjson.serializer.JavaBeanSerializer.write(JavaBeanSerializer.java:544)
	at com.alibaba.fastjson.serializer.JavaBeanSerializer.write(JavaBeanSerializer.java:154)
	at com.alibaba.fastjson.serializer.FieldSerializer.writeValue(FieldSerializer.java:318)
	at com.alibaba.fastjson.serializer.JavaBeanSerializer.write(JavaBeanSerializer.java:475)
	... 81 more
Caused by: java.lang.IllegalStateException: UT010034: Stream not in async mode
	at io.undertow.servlet.spec.ServletOutputStreamImpl.isReady(ServletOutputStreamImpl.java:757)
	at com.alibaba.fastjson.serializer.ASMSerializer_11_ServletOutputStreamImpl.write(Unknown Source)
	at com.alibaba.fastjson.serializer.FieldSerializer.writeValue(FieldSerializer.java:318)
	at com.alibaba.fastjson.serializer.JavaBeanSerializer.write(JavaBeanSerializer.java:475)
	... 84 more

[Solved] org.apache.flink.client.program.ProgramInvocationException: The main method caused an error

After the flick task starts the checkpoint and sets the status backend, the task is submitted for operation. The above errors occur. The specific errors are as follows:

org.apache.flink.client.program.ProgramInvocationException: The main method caused an error: org.apache.flink.runtime.concurrent.FutureUtils$RetryException: Could not complete the operation. Number of retries has been exhausted.
  at org.apache.flink.client.program.PackagedProgram.callMainMethod(PackagedProgram.java:366)
  at org.apache.flink.client.program.PackagedProgram.invokeInteractiveModeForExecution(PackagedProgram.java:219)
  at org.apache.flink.client.ClientUtils.executeProgram(ClientUtils.java:114)
  at org.apache.flink.client.cli.CliFrontend.executeProgram(CliFrontend.java:812)
  at org.apache.flink.client.cli.CliFrontend.run(CliFrontend.java:246)
  at org.apache.flink.client.cli.CliFrontend.parseAndRun(CliFrontend.java:1054)
  at org.apache.flink.client.cli.CliFrontend.lambda$main$10(CliFrontend.java:1132)
  at java.security.AccessController.doPrivileged(Native Method)
  at javax.security.auth.Subject.doAs(Subject.java:422)
  at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1761)
  at org.apache.flink.runtime.security.contexts.HadoopSecurityContext.runSecured(HadoopSecurityContext.java:41)
  at org.apache.flink.client.cli.CliFrontend.main(CliFrontend.java:1132)
Caused by: java.util.concurrent.ExecutionException: org.apache.flink.runtime.concurrent.FutureUtils$RetryException: Could not complete the operation. Number of retries has been exhausted.
  at java.util.concurrent.CompletableFuture.reportGet(CompletableFuture.java:357)
  at java.util.concurrent.CompletableFuture.get(CompletableFuture.java:1908)
  at org.apache.flink.client.program.StreamContextEnvironment.getJobExecutionResult(StreamContextEnvironment.java:123)
  at org.apache.flink.client.program.StreamContextEnvironment.execute(StreamContextEnvironment.java:80)
  at org.apache.flink.streaming.api.environment.StreamExecutionEnvironment.execute(StreamExecutionEnvironment.java:1782)
  at org.apache.flink.streaming.api.environment.StreamExecutionEnvironment.execute(StreamExecutionEnvironment.java:1765)
  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
  at java.lang.reflect.Method.invoke(Method.java:498)
  at org.apache.flink.client.program.PackagedProgram.callMainMethod(PackagedProgram.java:349)
  ... 11 more
Caused by: org.apache.flink.runtime.concurrent.FutureUtils$RetryException: Could not complete the operation. Number of retries has been exhausted.
  at org.apache.flink.runtime.concurrent.FutureUtils.lambda$retryOperationWithDelay$9(FutureUtils.java:386)
  at java.util.concurrent.CompletableFuture.uniWhenComplete(CompletableFuture.java:774)
  at java.util.concurrent.CompletableFuture$UniWhenComplete.tryFire(CompletableFuture.java:750)
  at java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:488)
  at java.util.concurrent.CompletableFuture.completeExceptionally(CompletableFuture.java:1990)
  at org.apache.flink.runtime.rest.RestClient.lambda$submitRequest$1(RestClient.java:430)
  at org.apache.flink.shaded.netty4.io.netty.util.concurrent.DefaultPromise.notifyListener0(DefaultPromise.java:577)
  at org.apache.flink.shaded.netty4.io.netty.util.concurrent.DefaultPromise.notifyListeners0(DefaultPromise.java:570)
  at org.apache.flink.shaded.netty4.io.netty.util.concurrent.DefaultPromise.notifyListenersNow(DefaultPromise.java:549)
  at org.apache.flink.shaded.netty4.io.netty.util.concurrent.DefaultPromise.notifyListeners(DefaultPromise.java:490)
  at org.apache.flink.shaded.netty4.io.netty.util.concurrent.DefaultPromise.setValue0(DefaultPromise.java:615)
  at org.apache.flink.shaded.netty4.io.netty.util.concurrent.DefaultPromise.setFailure0(DefaultPromise.java:608)
  at org.apache.flink.shaded.netty4.io.netty.util.concurrent.DefaultPromise.tryFailure(DefaultPromise.java:117)
  at org.apache.flink.shaded.netty4.io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.fulfillConnectPromise(AbstractNioChannel.java:321)
  at org.apache.flink.shaded.netty4.io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.finishConnect(AbstractNioChannel.java:337)
  at org.apache.flink.shaded.netty4.io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:702)
  at org.apache.flink.shaded.netty4.io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:650)
  at org.apache.flink.shaded.netty4.io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:576)
  at org.apache.flink.shaded.netty4.io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:493)
  at org.apache.flink.shaded.netty4.io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989)
  at org.apache.flink.shaded.netty4.io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
  at java.lang.Thread.run(Thread.java:748)
Caused by: java.util.concurrent.CompletionException: org.apache.flink.shaded.netty4.io.netty.channel.AbstractChannel$AnnotatedConnectException: Connection refused: xxxxx
  at java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:292)
  at java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:308)
  at java.util.concurrent.CompletableFuture.uniCompose(CompletableFuture.java:957)
  at java.util.concurrent.CompletableFuture$UniCompose.tryFire(CompletableFuture.java:940)
  ... 19 more
Caused by: org.apache.flink.shaded.netty4.io.netty.channel.AbstractChannel$AnnotatedConnectException: Connection refused: xxxxx
Caused by: java.net.ConnectException: Connection refused
  at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
  at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:714)
  at org.apache.flink.shaded.netty4.io.netty.channel.socket.nio.NioSocketChannel.doFinishConnect(NioSocketChannel.java:330)
  at org.apache.flink.shaded.netty4.io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.finishConnect(AbstractNioChannel.java:334)
  at org.apache.flink.shaded.netty4.io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:702)
  at org.apache.flink.shaded.netty4.io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:650)
  at org.apache.flink.shaded.netty4.io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:576)
  at org.apache.flink.shaded.netty4.io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:493)
  at org.apache.flink.shaded.netty4.io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989)
  at org.apache.flink.shaded.netty4.io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
  at java.lang.Thread.run(Thread.java:748)

After checking the yarn log, it may be the reason for the jar package conflict. After noting the dependency on Hadoop in the POM file, resubmit and run successfully.

[Solved] java.io.IOException: Got error, status=ERROR, status message, ack with firstBadLink as

Today, I reported such an error when uploading files to Hadoop

2022-03-17 17:17:11,994 INFO hdfs.DataStreamer: Exception in createBlockOutputStream blk_1073741946_1137
java.io.IOException: Got error, status=ERROR, status message , ack with firstBadLink as 120.78.239.136:9866
	at org.apache.hadoop.hdfs.protocol.datatransfer.DataTransferProtoUtil.checkBlockOpStatus(DataTransferProtoUtil.java:134)
	at org.apache.hadoop.hdfs.protocol.datatransfer.DataTransferProtoUtil.checkBlockOpStatus(DataTransferProtoUtil.java:110)
	at org.apache.hadoop.hdfs.DataStreamer.createBlockOutputStream(DataStreamer.java:1778)
	at org.apache.hadoop.hdfs.DataStreamer.nextBlockOutputStream(DataStreamer.java:1679)
	at org.apache.hadoop.hdfs.DataStreamer.run(DataStreamer.java:716)
2022-03-17 17:17:11,998 WARN hdfs.DataStreamer: Abandoning BP-1890970308-172.25.12.163-1646541195774:blk_1073741946_1137
2022-03-17 17:17:12,007 WARN hdfs.DataStreamer: Excluding datanode DatanodeInfoWithStorage[120.78.239.136:9866,DS-87287b18-21ac-4314-884e-d78b139945b8,DISK]

The result is that

slave1 has no copy

Reason and Solution:

slave1 did not turn off the firewall, so just turning off the firewall will be OK.

 

[Solved] Tomcat Do not Start Error: Error: Application Server not specified

Tomcat does not start, and reports Error: Application Server not specified. after checking, I found that although I followed the teacher’s steps, but the teacher did not import the local tomcat, it should already exist in the idea, and because I did not import it, I can not use it properly, I need to import the local downloaded tomcat

After importing the correct path, Tomcat can be enabled normally, because I have always added Tomcat plug-in to POM file, so I ignored this step.

Java Processbuilder Calls the command error: CreateProcess error = 2 

ArrayList<String> convert = new ArrayList<String>();
convert.add("ffmpeg -y -i C:/Users/fang/Desktop/1.m4a -ar 8000 -acodec mp3 C:/Users/fang/Desktop/5.mp3"); 
ProcessBuilder builder = new ProcessBuilder();
        try {
            builder.command(convert);
            // If this property is true, any error output generated by subsequent child processes started by the start() method of this object will be merged with the standard output.
            // so both can be read using the Process.getInputStream() method. This makes it easier to associate error messages with the corresponding output
            builder.redirectErrorStream(true);
            Process process = builder.start();

            InputStream is = process.getInputStream();
            InputStreamReader inst = new InputStreamReader(is, "GBK");
            BufferedReader br = new BufferedReader(inst);//Input stream buffer
            String res = null;
            StringBuilder sb = new StringBuilder();
            while ((res = br.readLine()) ! = null) {//Loop through the data in the buffer
                sb.append(res + "\n");
            }
            System.out.println(sb.toString());
        } catch (Exception e) {
            mark = false;
            System.out.println(e);
            e.printStackTrace();
        } finally {

        }

Solution:

The commands in processbuilder must be specified by full path, otherwise an error will be reported.

D:\\softwares\\ffmpeg-4.4.1-essentials_build\\bin\\ffmpeg.exe -y -i C:/Users/fang/Desktop/1.m4a -ar 8000 -acodec mp3 C:/Users/fang/Desktop/5.mp3

hive Run Error: Error: Java heap space [How to Solve]

Error: Java heap space solution

When using MR engine:

set mapreduce.map.memory.mb=12000;
set mapreduce.reduce.memory.mb=12000;
set mapred.map.child.java.opts=-server -Xmx10000m -Djava.net.preferIPv4Stack=true;
set io.sort.mb=100;
set mapred.reduce.child.java.opts=-server -Xmx10000m -Djava.net.preferIPv4Stack=true;

When using tez engine:

set hive.execution.engine=tez;
set tez.am.resource.memory.mb=9216;
set hive.exec.orc.split.strategy=BI;

Kotlin develop Error: java.lang.VerifyError [How to Solve]

When using kotlin+ coroutine, compiling APK will throw Java lang.VerifyError: Verifier rejected class …

Cause: a supend method marked by a coroutine uses @JvmStatic annotation, resulting in a verify error when compiling and parsing code.

Solution: remove the annotation of the supend method.

Reference: https://stackoverflow.com/questions/59113152/java-lang-verifyerror-verifier-rejected-class-code-working-fine-in-debug-mode

How to Solve Assert error (IDEA Package Imported)

When using the MyBatis-Plus starter project, we found that no matter which package under IDEA is imported, Assert will report an error, indicating that the suitable package is not downloaded from maven, and then we have to go to the maven repository ourselves to download the required package Junit.

Open the maven repository, https://mvnrepository.com/, and search for junit will appear many, I will generally choose the number of people using.



Mybatis Error: All elements are null [How to Solve]

Console error: your MySQL server version for the right syntax to use near ”at line 1

Reason: the database field and entity class field are inconsistent

The in the database is underlined, and the entity class uses the hump naming method.

Solution:

In the application.yml configuration file, turn on mybatis’ camel nomenclature conversion settings

The problem is solved

SpringCloud Use openFeign Multipartfile to Upload Files Error: Current request is not a multipart request

Error reporting information

feign MultipartException: Current request is not a multipart request

 

On the premise of introducing and configuring openfeign

1. Create FeignMultipartSupportConfig.class configuration file

Just copy and paste it directly

import feign.codec.Encoder;
import feign.form.spring.SpringFormEncoder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.context.annotation.Scope;

@Configuration
public class FeignMultipartSupportConfig {

    @Bean
    @Primary
    @Scope("prototype")
    public Encoder multipartFormEncoder() {
        return new SpringFormEncoder();
    }

    @Bean
    public feign.Logger.Level multipartLoggerLevel() {
        return feign.Logger.Level.FULL;
    }

}

2. Modify postmapping

    1. 1. MultipartFile type parameters use @RequestPart annotation, string parameters use annotation @RequestParam
    2. 2. Add consumes = MediaType.MULTIPART_FORM_DATA_VALUE
@FeignClient(value = "mk-other", fallback = MkOtherFeignFallBack.class)
public interface MkOtherFeign {
    @PostMapping(value = "/file/pic/upload",consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
    public ResponseResult picUpload(@RequestPart("file") MultipartFile file);
}

Reference link