spring-boot-plus solutions to common problems FAQ (XII)

spring-boot-plus solutions to common problems FAQ

Compile error problem

log log compilation error

Compile error logs and other tips log.info

solve

• Check whether the plug is installed lombok
• idea to install lombok
• eclipse installation lombok

---

Runtime Error problem

MySQL error

2019-07-31 14:16:52.412 ERROR 14724 --- [           main] com.alibaba.druid.pool.DruidDataSource   : init datasource error, url: jdbc:mysql://localhost:3306/spring_boot_plus?serverTimezone=Asia/Shanghai&useUnicode=true&characterEncoding=utf8&useSSL=false&allowPublicKeyRetrieval=true

com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.

You can not connect mysql

com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

solve

• Check the MySQL service is started
• Check the ip address and port number

Unknown database

com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Unknown database 'spring_boot_plus'

solve

• Check whether the new database spring_boot_plus
• The default database for spring_boot_plus, may change in different environments profile
• For example: application-local.yml in spring.datasource.url change the database name

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Redis error

org.springframework.data.redis.connection.PoolException: Could not get a resource from the pool; nested exception is io.lettuce.core.RedisConnectionException: Unable to connect to localhost:6379

You can not connect redis

Unable to connect to localhost:6379

solve

• Start redis service
• redis default port number: 6379
• The default password is not set
• Please depending on circumstances, to configure

---

Port is occupied

Caused by: java.net.BindException: Address already in use: bind

Caused by: java.net.BindException: Address already in use: bind
    at sun.nio.ch.Net.bind0(Native Method) ~[na:1.8.0_191]
    at sun.nio.ch.Net.bind(Net.java:433) ~[na:1.8.0_191]
    at sun.nio.ch.Net.bind(Net.java:425) ~[na:1.8.0_191]
    at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:223) ~[na:1.8.0_191]
    at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:74) ~[na:1.8.0_191]

Detailed error log

2019-08-02 23:23:41.350 ERROR 23380 --- [           main] org.apache.catalina.util.LifecycleBase   : Failed to start component [Connector[HTTP/1.1-8888]]

org.apache.catalina.LifecycleException: Protocol handler start failed
    at org.apache.catalina.connector.Connector.startInternal(Connector.java:1008) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
    at org.apache.catalina.core.StandardService.addConnector(StandardService.java:227) [tomcat-embed-core-9.0.21.jar:9.0.21]
    at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.addPreviouslyRemovedConnectors(TomcatWebServer.java:263) [spring-boot-2.1.6.RELEASE.jar:2.1.6.RELEASE]
    at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.start(TomcatWebServer.java:195) [spring-boot-2.1.6.RELEASE.jar:2.1.6.RELEASE]
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.startWebServer(ServletWebServerApplicationContext.java:296) [spring-boot-2.1.6.RELEASE.jar:2.1.6.RELEASE]
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.finishRefresh(ServletWebServerApplicationContext.java:162) [spring-boot-2.1.6.RELEASE.jar:2.1.6.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:552) [spring-context-5.1.8.RELEASE.jar:5.1.8.RELEASE]
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:140) [spring-boot-2.1.6.RELEASE.jar:2.1.6.RELEASE]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:742) [spring-boot-2.1.6.RELEASE.jar:2.1.6.RELEASE]
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:389) [spring-boot-2.1.6.RELEASE.jar:2.1.6.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:311) [spring-boot-2.1.6.RELEASE.jar:2.1.6.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1213) [spring-boot-2.1.6.RELEASE.jar:2.1.6.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1202) [spring-boot-2.1.6.RELEASE.jar:2.1.6.RELEASE]
    at io.geekidea.springbootplus.SpringBootPlusApplication.main(SpringBootPlusApplication.java:51) [classes/:na]
Caused by: java.net.BindException: Address already in use: bind
    at sun.nio.ch.Net.bind0(Native Method) ~[na:1.8.0_191]
    at sun.nio.ch.Net.bind(Net.java:433) ~[na:1.8.0_191]
    at sun.nio.ch.Net.bind(Net.java:425) ~[na:1.8.0_191]
    at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:223) ~[na:1.8.0_191]
    at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:74) ~[na:1.8.0_191]
    at org.apache.tomcat.util.net.NioEndpoint.initServerSocket(NioEndpoint.java:230) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
    at org.apache.tomcat.util.net.NioEndpoint.bind(NioEndpoint.java:213) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
    at org.apache.tomcat.util.net.AbstractEndpoint.bindWithCleanup(AbstractEndpoint.java:1124) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
    at org.apache.tomcat.util.net.AbstractEndpoint.start(AbstractEndpoint.java:1210) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
    at org.apache.coyote.AbstractProtocol.start(AbstractProtocol.java:585) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
    at org.apache.catalina.connector.Connector.startInternal(Connector.java:1005) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
    ... 14 common frames omitted

2019-08-02 23:23:41.356  INFO 23380 --- [           main] o.apache.catalina.core.StandardService   : Stopping service [Tomcat]
2019-08-02 23:23:41.362  WARN 23380 --- [           main] o.a.c.loader.WebappClassLoaderBase       : The web application [ROOT] appears to have started a thread named [lettuce-eventExecutorLoop-1-1] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
 sun.misc.Unsafe.park(Native Method)
 java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)
 java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2078)
 java.util.concurrent.LinkedBlockingQueue.poll(LinkedBlockingQueue.java:467)
 io.netty.util.concurrent.SingleThreadEventExecutor.takeTask(SingleThreadEventExecutor.java:252)
 io.netty.util.concurrent.DefaultEventExecutor.run(DefaultEventExecutor.java:64)
 io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:906)
 io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
 io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
 java.lang.Thread.run(Thread.java:748)
2019-08-02 23:23:41.363  WARN 23380 --- [           main] o.a.c.loader.WebappClassLoaderBase       : The web application [ROOT] appears to have started a thread named [Druid-ConnectionPool-Create-1916224178] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
 sun.misc.Unsafe.park(Native Method)
 java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
 java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
 com.alibaba.druid.pool.DruidDataSource$CreateConnectionThread.run(DruidDataSource.java:2672)
2019-08-02 23:23:41.364  WARN 23380 --- [           main] o.a.c.loader.WebappClassLoaderBase       : The web application [ROOT] appears to have started a thread named [Druid-ConnectionPool-Destroy-1916224178] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
 java.lang.Thread.sleep(Native Method)
 com.alibaba.druid.pool.DruidDataSource$DestroyConnectionThread.run(DruidDataSource.java:2768)
2019-08-02 23:23:41.377  INFO 23380 --- [           main] ConditionEvaluationReportLoggingListener : 

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2019-08-02 23:23:41.383 ERROR 23380 --- [           main] o.s.b.d.LoggingFailureAnalysisReporter   : 

***************************
APPLICATION FAILED TO START
***************************

Description:

The Tomcat connector configured to listen on port 8888 failed to start. The port may already be in use or the connector may be misconfigured.

Action:

Verify the connector's configuration, identify and stop any process that's listening on port 8888, or configure this application to listen on another port.

2019-08-02 23:23:41.410  INFO 23380 --- [           main] o.s.s.c.ThreadPoolTaskScheduler          : Shutting down ExecutorService 'taskScheduler'
2019-08-02 23:23:41.413  INFO 23380 --- [           main] o.s.s.c.ThreadPoolTaskScheduler          : Shutting down ExecutorService
2019-08-02 23:23:41.414  INFO 23380 --- [           main] o.s.s.concurrent.ThreadPoolTaskExecutor  : Shutting down ExecutorService 'applicationTaskExecutor'
2019-08-02 23:23:41.417  INFO 23380 --- [           main] com.alibaba.druid.pool.DruidDataSource   : {dataSource-1} closing ...
2019-08-02 23:23:41.421  INFO 23380 --- [           main] com.alibaba.druid.pool.DruidDataSource   : {dataSource-1} closed

Process finished with exit code 1

solve

Modify the port: application.local.ymlthe portdefault port8888

• Or kill off the process of the corresponding port
• Mac / linux: kill port
• Windows: find the corresponding java program, End Task

---

Spring Boot Admin can not access problems

Your host software abort a connection has been established

2019-07-31 16:33:37.205 ERROR 6696 --- [ctor-http-nio-2] o.s.w.s.adapter.HttpWebHandlerAdapter    : [f4aeb71d] Error [java.io.IOException: 你的主机中的软件中止了一个已建立的连接。] for HTTP GET "/applications", but ServerHttpResponse already committed (200 OK)

solve

8888 Port: The port is consistent with the current project

• yaml Configuration

spring:
  boot:
    admin:
      client:
        url: 'http://localhost:8888'
management:
  endpoints:
    web:
      exposure:
        include: "*"
  endpoint:
    health:
      show-details: ALWAYS

• Configuration properties

spring.boot.admin.client.url=http://localhost:8888
management.endpoints.web.exposure.include=*
management.endpoint.health.show-details=ALWAYS

---

Swagger problem

You can not access the swagger page

{"code":404,"data":null,"msg":"你请求的路径不存在","time":"2019-08-01 12:56:27"}

solve

• Check the WebMvcConfig.java class whether to exclude the swagger static resources

@Override
public void addResourceHandlers(ResourceHandlerRegistry registry) {
    registry.addResourceHandler("swagger-ui.html")
            .addResourceLocations("classpath:/META-INF/resources/");
    registry.addResourceHandler("/webjars/**")
            .addResourceLocations("classpath:/META-INF/resources/webjars/");
}

---

LocalDateTime date the use of class

Caused by: java.sql.SQLFeatureNotSupportedException

Caused by: java.sql.SQLFeatureNotSupportedException
    at com.alibaba.druid.pool.DruidPooledResultSet.getObject(DruidPooledResultSet.java:1771)
    at org.apache.ibatis.type.LocalDateTimeTypeHandler.getNullableResult(LocalDateTimeTypeHandler.java:38)
    at org.apache.ibatis.type.LocalDateTimeTypeHandler.getNullableResult(LocalDateTimeTypeHandler.java:28)
    at org.apache.ibatis.type.BaseTypeHandler.getResult(BaseTypeHandler.java:81)

org.springframework.dao.InvalidDataAccessApiUsageException: Error attempting to get column 'create_time' from result set.  Cause: java.sql.SQLFeatureNotSupportedException
; null; nested exception is java.sql.SQLFeatureNotSupportedException

    at org.springframework.jdbc.support.SQLExceptionSubclassTranslator.doTranslate(SQLExceptionSubclassTranslator.java:96)
    at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:72)
    at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:81)
    at org.mybatis.spring.MyBatisExceptionTranslator.translateExceptionIfPossible(MyBatisExceptionTranslator.java:73)
    at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:446)
    at com.sun.proxy.$Proxy134.selectOne(Unknown Source)
    at org.mybatis.spring.SqlSessionTemplate.selectOne(SqlSessionTemplate.java:166)
    at com.baomidou.mybatisplus.core.override.MybatisMapperMethod.execute(MybatisMapperMethod.java:89)
    at com.baomidou.mybatisplus.core.override.MybatisMapperProxy.invoke(MybatisMapperProxy.java:62)
    at com.sun.proxy.$Proxy139.getSysLogById(Unknown Source)
    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)

• The problem is JDK8 of LocalDate, LocalTime, LocalDateTime date type, druid data source is not yet supported
• druid issues

At present solution

1. Replace the data source
2. In mybatis-plus configuration generated code, generated as the date type DateType.ONLY_DATE, date type database generated as Date

// 全局配置
GlobalConfig gc = new GlobalConfig();
gc.setDateType(DateType.ONLY_DATE); // 设置日期类型为Date

Configuration mybatis-plus dateType

---

Operation and maintenance deployment issues

After the project packaging, dependencies loss

• spring-boot-plus.jar only 100 kb
• At this time, the main dependencies is not packaged in jar, check the configuration pom.xml

spring-boot-plus projects, pom.xml not directly inherit spring-boot-starter-parent

But introducing dependent spring-boot-dependencies

The advantage of this is that the project can inherit their parent pom

This way, to package, by default, packet loss can cause dependence, complete the following task

<plugin>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-maven-plugin</artifactId>
    <configuration>
        <mainClass>io.geekidea.springbootplus.SpringBootPlusApplication</mainClass>
    </configuration>
    <executions>
        <execution>
            <goals>
                <goal>repackage</goal>
            </goals>
        </execution>
    </executions>
</plugin>

• mainClass: Project Initiation class
• repackage: repackaging