Category Archives: Error

IDEA compile error: sun.misc.Base64decoder upgrade processing

Idea compile error report sun.misc.BASE64Decoder upgrade processing
warn:
17:01:15 /deploy/jenkins/workspace/auto-java-test/utils/ImageBase64Utils.java:67: warning: BASE64Encoder is internal proprietary API and may be removed in a future release
17:01:15 BASE64Encoder encoder = new BASE64Encoder();
import sun.misc.BASE64Decoder;
Alternative writing:
//Since JDK 1.8, the JDK public APIs of java.util.Base64.Decoder and java.util.Base64.Encoder have been provided, which can replace the JDK internal APIs of sun.misc.BASE64Decoder and sun.misc.BASE64Encoder.
//byte[] bytes = new BASE64Decoder().decodeBuffer(base64);
byte[] bytes = Base64.getDecoder().decode(base64);

//Or use method
import org.apache.commons.codec.binary.Base64;
return Base64.encodeBase64String(encrypted);

demo test class

@Test
    public void test2() throws Exception{
        //Decoder and java.util.Base64.Encoder are available from JDK 1.8 onwards, replacing the internal JDK APIs of sun.misc. .
        //byte[] bytes = new BASE64Decoder().decodeBuffer(base64);

        System.out.println("-----------------------Early Write ----------------------");
        String text = "String text";
         BASE64Encoder encoder = new BASE64Encoder();
         BASE64Decoder decoder = new BASE64Decoder();
         byte[] textByte = text.getBytes("UTF-8");
        //Code
         String encodedText = encoder.encode(textByte);
        System.out.println(encodedText);
        //Decoding
        System.out.println(new String(decoder.decodeBuffer(encodedText), "UTF-8"));

        /**
         * Compared with the Base64 codecs provided by sun.mis c suite and Apache Commons Codec, the Base64 provided by Java 8 has better performance. In the actual test of encoding and decoding speed, Base64 provided by Java 8 is at least 11 times faster than that provided by sun.mis c suite and at least 3 times faster than that provided by Apache Commons Codec. So if you want to use Base64 in Java, the Base64 category provided by the java .util package under Java 8 is definitely the first choice!
         * https://blog.csdn.net/zhou_kapenter/article/details/62890262
         */
        System.out.println("-----------------------New writing style----------------------");
        byte[] test11 = Base64.getEncoder().encode(textByte);
        System.out.println("test11_string="+new String(test11, "UTF-8"));
        byte[] bytes11 = Base64.getDecoder().decode(test11);
        System.out.println("test11="+new String(bytes11, "UTF-8"));

        System.out.println("-----------------------apache writing style----------------------");
        String test22 = org.apache.tomcat.util.codec.binary.Base64.encodeBase64String(textByte);
        System.out.println("test22_string="+test22);
        byte[] bytes22 = org.apache.tomcat.util.codec.binary.Base64.decodeBase64(test22);
        System.out.println("test22="+new String(bytes22, "UTF-8"));

        /**
         * Print results: Consistent results
         * ----------------------- early write ----------------------
         * 5a2X5Liy5paH5a2X
         * String text
         * ----------------------- new write ----------------------
         * test11 string = 5a2X5Liy5paH5a2X
         * test11=string literal
         * -----------------------apache writeup ----------------------
         * test22 string=5a2X5Liy5paH5a2X
         * test22=word string literal
         */
    }

[Solved] jmeter Stress Test Error: java.net.BindException: Address already in use: connect

When JMeter} performs stress testing, the following errors will be reported when testing with high threads for a long time:

Troubleshooting:

First, check the server log and find that there are no errors.

Then check the nginx data. It is found that the number of requests is inconsistent with the number of requests sent by the test. The server receives less and thinks of losing requests.

Later, after searching the information, it was found that it was the problem of the windows machine,

Reason: Windows provides 1024-5000 ports for TCP/IP links, and it takes four minutes to recycle them, which causes us to fill up the ports when running a large number of requests in a short time, resulting in an error report.

Solution (operate on the server where JMeter is located):

1. Enter regedit command in CMD to open the registry;

2. In HKEY_LOCAL_Machine\system\currentcontrolset\services\TCPIP\parameters right-click parameters;

3. Add a new DWORD named maxuserport;

4. Double click maxuserport, enter 65534 numerical data, and select decimal base;

5. After completing the above operations, be sure to restart the machine and solve the problem.

PS: Although the normal test can be carried out, the same problem occurs after increasing the number of threads a few days. The following configuration is required:

After the third step above, add tcptimedwaitdelay, the value is 30-300, and select decimal.

You still need to restart your computer

[Solved] mapper.xml Error: java.lang.AbstractMethodError: Method oracle/jdbc/driver/OracleResultSetImpl.getNString(Ljava/lang/String;)Ljava/lang/String; is abstract,

Error: java.lang.AbstractMethodError: Method oracle/jdbc/driver/OracleResultSetImpl.getNString(Ljava/lang/String;)Ljava/lang/String; is abstract,
Problem: The jdbcType definition in the mapper.xml code is not consistent with the one in the database and the entity class.

Solution 1: violent solution, directly remove the jdbcType in the resultMap defined in mapper.xml , do not specify the data type
Solution 2: Check the data types in the entity class, database and resultMap one by one, all three should be consistent

Attachment: Default mapping of MySQL data types, JDBC data types, Java data types

MySQL DATA TYPE	JDBC TYPE(getColumnTypeName)	The default JAVA type returned(getColumnClassName)
`BIT(1)` (new in MySQL-5.0)	`BIT`	`java.lang.Boolean`
`BIT( > 1)` (new in MySQL-5.0)	`BIT`	`byte[]`
`TINYINT`	`TINYINT`	`java.lang.Boolean` if the configuration property `tinyInt1isBit` is set to `true` (the default) and the storage size is 1, or `java.lang.Integer` if not.
`BOOL`, `BOOLEAN`	`TINYINT`	See `TINYINT`, above as these are aliases for `TINYINT(1)`, currently.
`SMALLINT[(M)] [UNSIGNED]`	`SMALLINT [UNSIGNED]`	`java.lang.Integer` (regardless of whether it is `UNSIGNED` or not)
`MEDIUMINT[(M)] [UNSIGNED]`	`MEDIUMINT [UNSIGNED]`	`java.lang.Integer` (regardless of whether it is `UNSIGNED` or not)
`INT,INTEGER[(M)] [UNSIGNED]`	`INTEGER [UNSIGNED]`	`java.lang.Integer`, if `UNSIGNED` `java.lang.Long`
`BIGINT[(M)] [UNSIGNED]`	`BIGINT [UNSIGNED]`	`java.lang.Long`, if UNSIGNED `java.math.BigInteger`
`FLOAT[(M,D)]`	`FLOAT`	`java.lang.Float`
`DOUBLE[(M,B)]`	`DOUBLE`	`java.lang.Double`
`DECIMAL[(M[,D])]`	`DECIMAL`	`java.math.BigDecimal`
`DATE`	`DATE`	`java.sql.Date`
`DATETIME`	`DATETIME`	`java.sql.Timestamp`
`TIMESTAMP[(M)]`	`TIMESTAMP`	`java.sql.Timestamp`
`TIME`	`TIME`	`java.sql.Time`
`YEAR[(2\|4)]`	`YEAR`	If `yearIsDateType` configuration property is set to `false`, then the returned object type is `java.sql.Short`. If set to `true` (the default), then the returned object is of type `java.sql.Date`with the date set to January 1st, at midnight.
`CHAR(M)`	`CHAR`	`java.lang.String` (unless the character set for the column is `BINARY`, then `byte[]` is returned.
`VARCHAR(M) [BINARY]`	`VARCHAR`	`java.lang.String` (unless the character set for the column is `BINARY`, then `byte[]` is returned.
`BINARY(M)`	`BINARY`	`byte[]`
`VARBINARY(M)`	`VARBINARY`	`byte[]`
`TINYBLOB`	`TINYBLOB`	`byte[]`
`TINYTEXT`	`VARCHAR`	`java.lang.String`
`BLOB`	`BLOB`	`byte[]`
`TEXT`	`VARCHAR`	`java.lang.String`
`MEDIUMBLOB`	`MEDIUMBLOB`	`byte[]`
`MEDIUMTEXT`	`VARCHAR`	`java.lang.String`
`LONGBLOB`	`LONGBLOB`	`byte[]`
`LONGTEXT`	`VARCHAR`	`java.lang.String`
`ENUM('value1','value2',...)`	`CHAR`	`java.lang.String`
`SET('value1','value2',...)`	`CHAR`	`java.lang.String`

MySQL JDBC allows conversions between different data types: the conversion table is as follows

MySQL DATA TYPE	JAVA types that can be converted
`CHAR, VARCHAR, BLOB, TEXT, ENUM, and SET`	`java.lang.String, java.io.InputStream, java.io.Reader, java.sql.Blob, java.sql.Clob`
`FLOAT, REAL, DOUBLE PRECISION, NUMERIC, DECIMAL, TINYINT, SMALLINT, MEDIUMINT, INTEGER, BIGINT`	`java.lang.String, java.lang.Short, java.lang.Integer, java.lang.Long, java.lang.Double, java.math.BigDecimal`
`DATE, TIME, DATETIME, TIMESTAMP`	`java.lang.String, java.sql.Date, java.sql.Timestamp`

[Solved] mybatis-plus getById() Method Error: Expected one result (or null) to be returned by selectOne(), but found: 2

Error:

org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.TooManyResultsException: Expected one result (or null) to be returned by selectOne(), but found: 2

	at org.mybatis.spring.MyBatisExceptionTranslator.translateExceptionIfPossible(MyBatisExceptionTranslator.java:92)
	at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:440)
	at com.sun.proxy.$Proxy153.selectOne(Unknown Source)
	at org.mybatis.spring.SqlSessionTemplate.selectOne(SqlSessionTemplate.java:159)
	at com.baomidou.mybatisplus.core.override.MybatisMapperMethod.execute(MybatisMapperMethod.java:90)
	at com.baomidou.mybatisplus.core.override.MybatisMapperProxy$PlainMethodInvoker.invoke(MybatisMapperProxy.java:148)
	at com.baomidou.mybatisplus.core.override.MybatisMapperProxy.invoke(MybatisMapperProxy.java:89)
	at com.sun.proxy.$Proxy156.selectById(Unknown Source)
	at com.baomidou.mybatisplus.extension.service.IService.getById(IService.java:199)
	at com.baomidou.mybatisplus.extension.service.IService$$FastClassBySpringCGLIB$$f8525d18.invoke(<generated>)
	at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218)
	at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:685)
	at cn.com.chnsys.eleac4.sys_common.service.impl.ConfigRuleDetailServiceImpl$$EnhancerBySpringCGLIB$$4e131247.getById(<generated>)
	at cn.com.chnsys.eleac4.rule.RuleApplicationTests.test3(RuleApplicationTests.java:91)
	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.junit.platform.commons.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:675)
	at org.junit.jupiter.engine.execution.MethodInvocation.proceed(MethodInvocation.java:60)
	at org.junit.jupiter.engine.execution.InvocationInterceptorChain$ValidatingInvocation.proceed(InvocationInterceptorChain.java:125)
	at org.junit.jupiter.engine.extension.TimeoutExtension.intercept(TimeoutExtension.java:132)
	at org.junit.jupiter.engine.extension.TimeoutExtension.interceptTestableMethod(TimeoutExtension.java:124)
	at org.junit.jupiter.engine.extension.TimeoutExtension.interceptTestMethod(TimeoutExtension.java:74)
	at org.junit.jupiter.engine.execution.ExecutableInvoker$ReflectiveInterceptorCall.lambda$ofVoidMethod$0(ExecutableInvoker.java:115)
	at org.junit.jupiter.engine.execution.ExecutableInvoker.lambda$invoke$0(ExecutableInvoker.java:105)
	at org.junit.jupiter.engine.execution.InvocationInterceptorChain$InterceptedInvocation.proceed(InvocationInterceptorChain.java:104)
	at org.junit.jupiter.engine.execution.InvocationInterceptorChain.proceed(InvocationInterceptorChain.java:62)
	at org.junit.jupiter.engine.execution.InvocationInterceptorChain.chainAndInvoke(InvocationInterceptorChain.java:43)
	at org.junit.jupiter.engine.execution.InvocationInterceptorChain.invoke(InvocationInterceptorChain.java:35)
	at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:104)
	at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:98)
	at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeTestMethod$6(TestMethodTestDescriptor.java:202)
	at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
	at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeTestMethod(TestMethodTestDescriptor.java:198)
	at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:135)
	at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:69)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:135)
	at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:125)
	at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:135)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:123)
	at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:122)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:80)
	at java.util.ArrayList.forEach(ArrayList.java:1249)
	at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:139)
	at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:125)
	at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:135)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:123)
	at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:122)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:80)
	at java.util.ArrayList.forEach(ArrayList.java:1249)
	at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:139)
	at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:125)
	at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:135)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:123)
	at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:122)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:80)
	at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.submit(SameThreadHierarchicalTestExecutorService.java:32)
	at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:57)
	at org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java:51)
	at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:229)
	at org.junit.platform.launcher.core.DefaultLauncher.lambda$execute$6(DefaultLauncher.java:197)
	at org.junit.platform.launcher.core.DefaultLauncher.withInterceptedStreams(DefaultLauncher.java:211)
	at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:191)
	at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:128)
	at com.intellij.junit5.JUnit5IdeaTestRunner.startRunnerWithArgs(JUnit5IdeaTestRunner.java:69)
	at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33)
	at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:230)
	at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:58)
Caused by: org.apache.ibatis.exceptions.TooManyResultsException: Expected one result (or null) to be returned by selectOne(), but found: 2
	at org.apache.ibatis.session.defaults.DefaultSqlSession.selectOne(DefaultSqlSession.java:80)
	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.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:426)
	... 75 more

SQL query log:

Creating a new SqlSession
SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@140fa482] was not registered for synchronization because synchronization is not active
JDBC Connection [HikariProxyConnection@2027818863 wrapping com.mysql.jdbc.JDBC4Connection@3b063aaf] will not be managed by Spring
==>  Preparing: SELECT ID,ZONGTPZID AS configTotalId,ZONGTPZLX AS configTotalType,ZONGTPZMC AS configTotalName,XUNCXMC AS configRuleDetailName,ZHUCID AS registrId,JISGZ AS calRule,BEIYZFC8 AS ReservedString8,BEIYZFC7 AS ReservedString7,BEIYZFC6 AS ReservedString6,BEIYZFC5 AS ReservedString5,BEIYZFC4 AS ReservedString4,BEIYZFC3 AS ReservedString3,BEIYZFC2 AS ReservedString2,BEIYZFC1 AS ReservedString1,BEIYZT5 AS ReservedInt5,BEIYZT4 AS ReservedInt4,BEIYZT3 AS ReservedInt3,BEIYZT2 AS ReservedInt2,BEIYZT1 AS ReservedInt1 FROM eleac_guizpz WHERE ID=?
==> Parameters: 4(Integer)
<==    Columns: ID, configTotalId, configTotalType, configTotalName, configRuleDetailName, registrId, calRule, ReservedString8, ReservedString7, ReservedString6, ReservedString5, ReservedString4, ReservedString3, ReservedString2, ReservedString1, ReservedInt5, ReservedInt4, ReservedInt3, ReservedInt2, ReservedInt1
<==        Row: 4, 4, 4, Full, 2, <<BLOB>>, null, null, null, null, null, null, null, null, null, null, null, null, null
<==        Row: 4C56B386-8257-4991-A6BF-29D2EEFBF299, 1, 1, 1, <<BLOB>>, null, null, null, null, null, null, null, null, null, null, null, null, null
<==      Total: 2
Closing non transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@140fa482]

error analysis

Viewing the entity object, it is found that the primary key ID data type is string and the database primary key type is varcher

The parameter of SQL is integer, which is different from the entity data type. It is related to the underlying principle of mybayis plus and will not be analyzed here.

Error resolution: modify the query parameter to string,

Creating a new SqlSession
SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@439047ef] was not registered for synchronization because synchronization is not active
JDBC Connection [HikariProxyConnection@2114163679 wrapping com.mysql.jdbc.JDBC4Connection@301b2259] will not be managed by Spring
==>  Preparing: SELECT ID,ZONGTPZID AS configTotalId,ZONGTPZLX AS configTotalType,ZONGTPZMC AS configTotalName,XUNCXMC AS configRuleDetailName,ZHUCID AS registrId,JISGZ AS calRule,BEIYZFC8 AS ReservedString8,BEIYZFC7 AS ReservedString7,BEIYZFC6 AS ReservedString6,BEIYZFC5 AS ReservedString5,BEIYZFC4 AS ReservedString4,BEIYZFC3 AS ReservedString3,BEIYZFC2 AS ReservedString2,BEIYZFC1 AS ReservedString1,BEIYZT5 AS ReservedInt5,BEIYZT4 AS ReservedInt4,BEIYZT3 AS ReservedInt3,BEIYZT2 AS ReservedInt2,BEIYZT1 AS ReservedInt1 FROM eleac_guizpz WHERE ID=?
==> Parameters: 4(String)
<==    Columns: ID, configTotalId, configTotalType, configTotalName, configRuleDetailName, registrId, calRule, ReservedString8, ReservedString7, ReservedString6, ReservedString5, ReservedString4, ReservedString3, ReservedString2, ReservedString1, ReservedInt5, ReservedInt4, ReservedInt3, ReservedInt2, ReservedInt1
<==        Row: 4, 4, 4, Full, 2, <<BLOB>>, null, null, null, null, null, null, null, null, null, null, null, null, null
<==      Total: 1
Closing non transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@439047ef]

[Solved] codeblocks Error: ‘to_string’ was not declared in this scope

“To_string ‘was not declared in this scope” is sometimes encountered when using CodeBlocks (the compiler adopts MinGW) under windows Code blocks, to_ String and so on, which only introduces the parts and solutions related to this problem
first, to_String is a new function introduced by C + + 11, which may not be supported by the old compiler, so “C + + 11” compilation support should be added to the compiler: open Settings -> Compiler

Check the C + + 11 standard here
of course, you should also check your code for problems. to_String is contained in string, and string is contained in space STD, so your code should include header file and related space introduction, for example:

#include <iostream>
#include <string> //std::string std::to_string

using namespace std;

int main()
{
    int a = 123;
    cout << "a = " << to_string(a) <<endl; // If you don't add namespaces you can use std::to_string here

    return 0;
}

[Solved] maven Project Compile Error: was cached in the local repository, resolution will not be reattempte

The error contents are as follows: was cached in the local repository, resolution will not be reatempted until the update interval of central has elapsed or updates are forced

Solution: Go to the pom.xml of the compile project to check if there are duplicate dependencies. If it is duplicated, just delete one.

[Solved] TestNg Package Error: SLF4J: Failed to load class “org.slf4j.impl.StaticLoggerBinder”.

Add it to the pom file to solve it

<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-simple</artifactId>
<version>1.7.25</version>
<scope>compile</scope>
</dependency>

[Solved] git clone Error: SSL certificate prob lem: self signed certificate

Execute first:

git config --global http.sslVerify false

Then re-execute the GIT clone command

[Solved] SQLSTATE[23000]: Integrity constraint violation: 1048 Column ‘vod_content’.

ALTER TABLE `mac_vod` CHANGE `vod_content` `vod_content` TEXT CHARACTER SET utf8 COLLATE utf8_general_ci NULL;

The above line of code solves the error when collecting Apple cms v10 custom interface. The reason is that the vod_content of the database is wrong, you can try;

The following is the error content:

1 SQLSTATE[23000]: Integrity constraint violation: 1048 Column ‘vod_content’ ……

ALTER TABLE `mac_vod` CHANGE `vod_content` `vod_content` TEXT CHARACTER SET utf8 COLLATE utf8_general_ci NULL;

[Solved] Multiple Contexts have a path of ”/xxx”

Resolve multiple contexts have a path of ”/xxx ” error

Scenario description

There was originally a dynamic web project project in Eclipse: myjspproject. There is no managed Tomcat. Later, modify the code of tomcat, delete the server folder in eclipse, redeploy the server, and then deploy it to Tomcat. At this time, Tomcat reports an error: multiple contexts have a path of “/ spring mvc001”, as shown below:

Error reason

Myjspproject already exists in Tomcat; However, the path value of the context of the regenerated project myjspproject is still myjspproject, resulting in a conflict.

Solution:

Please follow the steps below to modify.

Change the path to/myjspproject2 and save the configuration.

DebugAH

How to Solve Your Programmer Error