Category Archives: Error

[Solved] VScode Error: PS D:\vscode＞ cd “d:\vscode\“ ; if ($?) { g++ tempCodeRunnerFile.cpp -o tempCodeRunn

Just change the code UTF-8 to GB18030

at first, just modify the code in the lower right corner

[Solved] Junit.test use error: log4j:WARN No appenders could be found for logger

1. Warning message
Error output message.
log4j:WARN No appenders could be found for logger (org.apache.ibatis.logging.LogFactory).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.

Solution:
2.1 No log4j dependency is introduced
Insert the following code in the pom.xml file.

<dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>

Configure the log4j.properties file and put this folder under Src/main/resources

log4j.rootLogger=debug, stdout, R

log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout

# Pattern to output the caller's file name and line number.
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] (%F:%L) - %m%n

log4j.appender.R=org.apache.log4j.RollingFileAppender
log4j.appender.R.File=example.log

log4j.appender.R.MaxFileSize=100KB
# Keep one backup file
log4j.appender.R.MaxBackupIndex=5

log4j.appender.R.layout=org.apache.log4j.PatternLayout
log4j.appender.R.layout.ConversionPattern=%p %t %c - %m%n

perhaps

# Set root category priority to INFO and its only appender to CONSOLE.
#log4j.rootCategory=INFO, CONSOLE            debug   info   warn error fatal
log4j.rootCategory=debug, CONSOLE, LOGFILE

# Set the enterprise logger category to FATAL and its only appender to CONSOLE.
log4j.logger.org.apache.axis.enterprise=FATAL, CONSOLE

# CONSOLE is set to be a ConsoleAppender using a PatternLayout.
log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout
log4j.appender.CONSOLE.layout.ConversionPattern=%d{ISO8601} %-6r [%15.15t] %-5p %30.30c %x - %m\n

# LOGFILE is set to be a File appender using a PatternLayout.
log4j.appender.LOGFILE=org.apache.log4j.FileAppender
log4j.appender.LOGFILE.File=d:\axis.log
log4j.appender.LOGFILE.Append=true
log4j.appender.LOGFILE.layout=org.apache.log4j.PatternLayout
log4j.appender.LOGFILE.layout.ConversionPattern=%d{ISO8601} %-6r [%15.15t] %-5p %30.30c %x - %m\n

Apple M1: How to Solve Spark runs Error

snappy-java-1.1.8.3 (2021-01-20)

Could not initialize class org.xerial.snappy.Snappy
m1 no native library is found for os.name=mac and os.arch=aarch64

Solution:

<dependency>
    <groupId>org.xerial.snappy</groupId>
    <artifactId>snappy-java</artifactId>
    <version>1.1.8.3</version>
    <scope>provided</scope>
</dependency>

The latest package can support M1 chip.

[Solved] JDBC error: Communications link failure

Change url: In addition?useUnicode=true& CharacterEncoding=UTF-8& serverTimezone=UTC”

 <!-- Database connection pooling -->
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource"
          destroy-method="close">
        <property name="url" value="jdbc:mysql://localhost:3306/user_db?useUnicode=true&amp;characterEncoding=UTF-8&amp;serverTimezone=UTC" />
        <property name="username" value="root" />
        <property name="password" value="123456" />
        <property name="driverClassName" value="com.mysql.jdbc.Driver" />
    </bean>

[Solved] Android HTTPS request resource or interface error: server certificate

Error log:

javax.net.ssl.SSLHandshakeException: java.security.cert.CertPathValidatorException: Trust anchor for certification path not found.
        at com.android.org.conscrypt.ConscryptFileDescriptorSocket.startHandshake(ConscryptFileDescriptorSocket.java:229)
        at com.android.okhttp.internal.io.RealConnection.connectTls(RealConnection.java:192)
        at com.android.okhttp.internal.io.RealConnection.connectSocket(RealConnection.java:149)
        at com.android.okhttp.internal.io.RealConnection.connect(RealConnection.java:112)
        at com.android.okhttp.internal.http.StreamAllocation.findConnection(StreamAllocation.java:184)
        at com.android.okhttp.internal.http.StreamAllocation.findHealthyConnection(StreamAllocation.java:126)
        at com.android.okhttp.internal.http.StreamAllocation.newStream(StreamAllocation.java:95)
        at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:281)
        at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:224)
        at com.android.okhttp.internal.huc.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:461)
        at com.android.okhttp.internal.huc.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:127)
        at com.android.okhttp.internal.huc.DelegatingHttpsURLConnection.connect(DelegatingHttpsURLConnection.java:89)
        at com.android.okhttp.internal.huc.HttpsURLConnectionImpl.connect(HttpsURLConnectionImpl.java:26)
        at com.bumptech.glide.load.data.HttpUrlFetcher.loadDataWithRedirects(HttpUrlFetcher.java:100)
        at com.bumptech.glide.load.data.HttpUrlFetcher.loadData(HttpUrlFetcher.java:56)
        at com.bumptech.glide.load.model.MultiModelLoader$MultiFetcher.loadData(MultiModelLoader.java:100)
        at com.bumptech.glide.load.model.MultiModelLoader$MultiFetcher.startNextOrFail(MultiModelLoader.java:164)
        at com.bumptech.glide.load.model.MultiModelLoader$MultiFetcher.onLoadFailed(MultiModelLoader.java:154)
        at com.bumptech.glide.load.data.HttpUrlFetcher.loadData(HttpUrlFetcher.java:62)
        at com.bumptech.glide.load.model.MultiModelLoader$MultiFetcher.loadData(MultiModelLoader.java:100)
        at com.bumptech.glide.load.engine.SourceGenerator.startNextLoad(SourceGenerator.java:70)
        at com.bumptech.glide.load.engine.SourceGenerator.startNext(SourceGenerator.java:63)
        at com.bumptech.glide.load.engine.DecodeJob.runGenerators(DecodeJob.java:310)
        at com.bumptech.glide.load.engine.DecodeJob.runWrapped(DecodeJob.java:276)
        at com.bumptech.glide.load.engine.DecodeJob.run(DecodeJob.java:234)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
        at java.lang.Thread.run(Thread.java:764)
        at com.bumptech.glide.load.engine.executor.GlideExecutor$DefaultThreadFactory$1.run(GlideExecutor.java:393)
     Caused by: java.security.cert.CertificateException: java.security.cert.CertPathValidatorException: Trust anchor for certification path not found.
        at com.android.org.conscrypt.TrustManagerImpl.checkTrustedRecursive(TrustManagerImpl.java:646)
        at com.android.org.conscrypt.TrustManagerImpl.checkTrusted(TrustManagerImpl.java:495)
        at com.android.org.conscrypt.TrustManagerImpl.checkTrusted(TrustManagerImpl.java:418)
        at com.android.org.conscrypt.TrustManagerImpl.getTrustedChainForServer(TrustManagerImpl.java:339)
        at android.security.net.config.NetworkSecurityTrustManager.checkServerTrusted(NetworkSecurityTrustManager.java:94)
        at android.security.net.config.RootTrustManager.checkServerTrusted(RootTrustManager.java:88)
        at com.android.org.conscrypt.Platform.checkServerTrusted(Platform.java:208)
        at com.android.org.conscrypt.ConscryptFileDescriptorSocket.verifyCertificateChain(ConscryptFileDescriptorSocket.java:404)
        at com.android.org.conscrypt.NativeCrypto.SSL_do_handshake(Native Method)
        at com.android.org.conscrypt.NativeSsl.doHandshake(NativeSsl.java:375)
        at com.android.org.conscrypt.ConscryptFileDescriptorSocket.startHandshake(ConscryptFileDescriptorSocket.java:224)
        at com.android.okhttp.internal.io.RealConnection.connectTls(RealConnection.java:192) 
        at com.android.okhttp.internal.io.RealConnection.connectSocket(RealConnection.java:149) 
        at com.android.okhttp.internal.io.RealConnection.connect(RealConnection.java:112) 
        at com.android.okhttp.internal.http.StreamAllocation.findConnection(StreamAllocation.java:184) 
        at com.android.okhttp.internal.http.StreamAllocation.findHealthyConnection(StreamAllocation.java:126) 
        at com.android.okhttp.internal.http.StreamAllocation.newStream(StreamAllocation.java:95) 
        at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:281) 
        at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:224) 
        at com.android.okhttp.internal.huc.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:461) 
        at com.android.okhttp.internal.huc.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:127) 
        at com.android.okhttp.internal.huc.DelegatingHttpsURLConnection.connect(DelegatingHttpsURLConnection.java:89) 
        at com.android.okhttp.internal.huc.HttpsURLConnectionImpl.connect(HttpsURLConnectionImpl.java:26) 
        at com.bumptech.glide.load.data.HttpUrlFetcher.loadDataWithRedirects(HttpUrlFetcher.java:100) 
        at com.bumptech.glide.load.data.HttpUrlFetcher.loadData(HttpUrlFetcher.java:56) 
        at com.bumptech.glide.load.model.MultiModelLoader$MultiFetcher.loadData(MultiModelLoader.java:100) 
        at com.bumptech.glide.load.model.MultiModelLoader$MultiFetcher.startNextOrFail(MultiModelLoader.java:164) 
        at com.bumptech.glide.load.model.MultiModelLoader$MultiFetcher.onLoadFailed(MultiModelLoader.java:154) 
        at com.bumptech.glide.load.data.HttpUrlFetcher.loadData(HttpUrlFetcher.java:62) 
        at com.bumptech.glide.load.model.MultiModelLoader$MultiFetcher.loadData(MultiModelLoader.java:100) 
        at com.bumptech.glide.load.engine.SourceGenerator.startNextLoad(SourceGenerator.java:70) 
        at com.bumptech.glide.load.engine.SourceGenerator.startNext(SourceGenerator.java:63) 
        at com.bumptech.glide.load.engine.DecodeJob.runGenerators(DecodeJob.java:310) 
        at com.bumptech.glide.load.engine.DecodeJob.runWrapped(DecodeJob.java:276) 
        at com.bumptech.glide.load.engine.DecodeJob.run(DecodeJob.java:234) 
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167) 
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641) 
        at java.lang.Thread.run(Thread.java:764) 
        at com.bumptech.glide.load.engine.executor.GlideExecutor$DefaultThreadFactory$1.run(GlideExecutor.java:393)

Solution:

package com.ex.pu;

import android.app.Application;

import java.security.SecureRandom;
import java.security.cert.X509Certificate;

import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSession;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;

public class CApp extends Application {

    @Override
    public void onCreate() {
        super.onCreate();

        // global handling of certificate issues
        handleSSLHandshake();
    }

    /**
     * handle certificate issues globally
     * Ignore the certificate checksum for https
     * Avoid Glide loading https images reporting errors.
     * javax.net.ssl.SSLHandshakeException: java.security.cert.CertPathValidatorException: Trust anchor for certification path not found.
     */
    public static void handleSSLHandshake() {
        try {
            TrustManager[] trustAllCerts = new TrustManager[]{new X509TrustManager() {
                public X509Certificate[] getAcceptedIssuers() {
                    return new X509Certificate[0];
                }

                @Override
                public void checkClientTrusted(X509Certificate[] certs, String authType) { }

                @Override
                public void checkServerTrusted(X509Certificate[] certs, String authType) { }
            }};

            SSLContext sc = SSLContext.getInstance("TLS");
            // trustAllCerts trusts all certificates
            sc.init(null, trustAllCerts, new SecureRandom());
            HttpsURLConnection.setDefaultSSLSocketFactory(sc.getSocketFactory());
            HttpsURLConnection.setDefaultHostnameVerifier(new HostnameVerifier() {
                @Override
                public boolean verify(String hostname, SSLSession session) {
                    return true;
                }
            });

        } catch (Exception e) {
        }
    }
}

[Solved] Chrome Error: The request client is not a secure context

1. Background

When using Ajax to access across domains, an error is suddenly reported:

 Access to XMLHttpRequest at 'http://127.0.0.1:yyy/' from origin 'http://xxx:yyy' 
 has been blocked by CORS policy: 
 The request client is not a secure context 
 and the resource is in more-private address space `local`.

The general meaning is that the request is blocked by cross-domain policy, and the client is not secure.

2. Analysis

Baidu has found many times that it is caused by the upgrade of Chrome browser, and this problem also exists in edge browser.

3. Solution

Enter in the address field chrome://flags/#block -Secure private network requests , change the option to disable disable, and then restart the browser

[Solved] Lumen Error: Class redis does not exist

The company deployed a new project using lumen. The access interface reported a class redis does not exist error, which literally means that redis could not be found. After looking for a solution for a long time, it was later found that the redis plug-in was not added in composer.json, so the container could not find the redis service when loading. The solution is as follows:

1. Add “illuminate/redis” in composer.json: “^ 5.4”

2. Re execute composer install (if the lock file cannot be executed, delete composer.lock and then execute). After successful execution, the redis folder will be generated under vendor\illuminate

3. In bootstrap/app.php, add $app ->; register(Illuminate\Redis\RedisServiceProvider::class);

[Solved] Canal 1.1.5 Startup Error: caching_sha2_password Auth failed

1. Phenomenon

java.io.IOException: caching_sha2_password Auth failed
        at com.alibaba.otter.canal.parse.driver.mysql.MysqlConnector.negotiate(MysqlConnector.java:260) ~[canal.parse.driver-1.1.5.jar:na]
        at com.alibaba.otter.canal.parse.driver.mysql.MysqlConnector.connect(MysqlConnector.java:82) ~[canal.parse.driver-1.1.5.jar:na]
        ... 4 common frames omitted
2021-11-20 16:43:40.852 [destination = example , address = /127.0.0.1:3306 , EventParser] ERROR com.alibaba.otter.canal.common.alarm.LogAlarmHandler - destination:example[com.alibaba.otter.canal.parse.exception.CanalParseException: java.io.IOException: connect /127.0.0.1:3306 failure

2. Analysis and positioning

Since MySQL 8.0.3, the authentication plug-in uses caching by default_sha2_password

3. Solution

Solution: modify the authentication plug-in corresponding to the canal user to MySQL_native_password

mysql> select host,user,plugin from mysql.user ;
mysql> ALTER USER 'canal'@'%' IDENTIFIED WITH mysql_native_password BY 'password';

renderings

Android Studio compile error: build tools is corrupt [Solved]

Error Messages:
Installed Build Tools revision 32.0.0 rc1 is corrupted. Remove and install again using the SDK Manager.
Problem Cause.
File corruption in buildTools after AndroidSutdio version upgrade.

Solution:
1 Modify d8.bat to dx.bat
2 Modify d8.jar to dx.jar

Mongodb Crash Error: Too many open files [How to Solve]

Problem analysis of mongodb crash error too many open files

during the actual use of the project, the customer reported that he could open the web page but could not log in. He felt that the database server should hang up for the first time, so he checked the mongodb database server log, and sure enough, it hung up. The error information is as follows:

2020-12-28T13:21:21.731+0800 E STORAGE  [conn2624] WiredTiger error (24) [1609132881:731616][23581:0x7fe157189700], WT_SESSION.create: __posix_directory_sync, 151: /data1/mongodb/data/db/collection-1063-1706476241051221735.wt: directory-sync: Too many open files Raw: [1609132881:731616][23581:0x7fe157189700], WT_SESSION.create: __posix_directory_sync, 151: /data1/mongodb/data/db/collection-1063-1706476241051221735.wt: directory-sync: Too many open files

Cause of problem:

The number of open files on the system has reached the maximum
The reason for the above problem is that Centos7 gives each user a default number of files to open at the same time of 1024, which can be checked with the ulitme -u command

Problem solving:

1. Modify the limits.conf default parameters and add the following under the file.
* soft nofile 65536
* hard nofile 65536
PS: After saving as above, you need to reboot the system to take effect permanently

2, dynamic modification (no need to restart the system and mongo)
2.1, check the mongodb service pid file
        ps aux | grep mongo
2.2、After getting the pid file, check the corresponding pid limits, the following command
        cat /proc/95051/limits
2.3、Run the following command to achieve dynamic changes
        prlimit --pid 95051 --nofile=65535:65535
2.4. Check again, the modification is successful

proposal

It is recommended that new servers first change the system default parameters

[Solved] mqttfx Error: Error Loading External CSS Resource

1. Error message

2. Reasons

This is because the custom mode is selected when using mqtt.fx. The software remembers this configuration and does not completely clean the configuration when reinstalling or uninstalling

3. Treatment method

Modify the configuration file
Path: C:\users\{administrator user name}\appdata\local\mqtt FX
the following: mqttfx config.xml
Modify: modify custom to light

<styleName>LIGHT</styleName>

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