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Spring boot应用启动后首次访问很慢怎么解决

发布时间:2021-06-23 13:55:10 来源:亿速云 阅读:614 作者:chen 栏目:开发技术

这篇文章主要介绍“Spring boot应用启动后首次访问很慢怎么解决”,在日常操作中,相信很多人在Spring boot应用启动后首次访问很慢怎么解决问题上存在疑惑,小编查阅了各式资料,整理出简单好用的操作方法,希望对大家解答”Spring boot应用启动后首次访问很慢怎么解决”的疑惑有所帮助!接下来,请跟着小编一起来学习吧!

Spring boot应用在ECS服务器上启动后首次访问很慢的问题

环境:

  • CentOS7

  • JDK1.8

  • MYSQL8

  • 应用是Spring boot框架的(内嵌式tomcat)jar文件

问题描述:

通过命令:nohup java -jar XXXX.jar & 启动项目后浏览器访问响应十分的缓慢,网页图片和css等静态资源加载的十分缓慢(网站登录更是需要好几分钟才能完全加载完毕)。

然后在Google浏览器搜索了一下(已翻墙),搜索需用英文,类似问题看来不是个例呀,甚至JDK bug列表汇中就有相似的bug,如JDK-6521844 : SecureRandom hangs on Linux Systems,但这些bug都标记为fixed。但明显没有完全fix掉啊。然后继续找,原来

Avoiding JVM Delays Caused by Random Number Generation

正好记录了这个随机数生成慢的原因和解决方案。Java随机数生成依赖熵源(Entropy Source),默认的阻塞型的 /dev/random熵源可能导致阻塞,而换一个非阻塞的 /dev/urandom的熵源就可以了。

进入你的JAVA_HOME的jre目录下找到并vim编辑这个文件:

$JAVA_HOME/jre/lib/security/java.security

找到:

securerandom.source=file:/dev/random 这一行

改之前:

securerandom.source=file:/dev/random

改为:

securerandom.source=file:/dev/urandom

然后保存修改就OK了!

Spring boot静态资源访问太慢

Spring boot应用启动后首次访问很慢怎么解决

产生的问题:

spring boot 启动的服务静态资源非常慢,慢到无法忍受。

排查过程 一

1. 在filter 中记录请求时间 ,得到某些静态资源居然600ms,但是主要问题不在这里,是客户端的连接被阻塞了。如上图

2. 然后然后禁用filter(直接spring boot static) 返回

3. 结果还是很慢

排查过程 二

1. 开启客户端资源 GZIP

2. 手动设置cache-contro

结果还是很慢,我就很疑惑了,难道是选用的资源有问题,看着也很正常。

于是我就把资源都放到 python flask!! 结果比java的快了好几倍。。 瞬间我人就蒙了。

然后仔细看application.xml 配置,其实当时也没设置什么东西 ,于是一项一项的注释,效率上还是没变化,我就试了试新建一个项目,然后把 html 都拿过去。

问题解决了!! 速度 非常快

好家伙,我直接好家伙,我查了几天的问题,居然可能是在依赖上。

最后结论 :应该是某一个依赖项有问题导致的,或者版本本身不对劲

有空再去看看2.3.4 的 底层tomcat配置有什么不同

有问题的配置

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.3.4.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.tianlun</groupId>
    <artifactId>tianlunpc</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>tianlunpc</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <!-- session jdbc -->
        <dependency>
            <groupId>org.springframework.session</groupId>
            <artifactId>spring-session-jdbc</artifactId>
        </dependency>
        <!--热部署-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <optional>true</optional>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

没问题的配置

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.tianlun</groupId>
    <artifactId>tianlinpc</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>tianlinpc</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>1.8</java.version>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <spring-boot.version>2.3.7.RELEASE</spring-boot.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>2.6</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.session</groupId>
            <artifactId>spring-session-core</artifactId>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <!--热部署-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    </dependencies>
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>${spring-boot.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>
    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.8.1</version>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                    <encoding>UTF-8</encoding>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <version>2.3.7.RELEASE</version>
                <configuration>
                    <mainClass>com.tianlun.tianlunpc.TianlinpcApplication</mainClass>
                </configuration>
                <executions>
                    <execution>
                        <id>repackage</id>
                        <goals>
                            <goal>repackage</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
</project>

到此,关于“Spring boot应用启动后首次访问很慢怎么解决”的学习就结束了,希望能够解决大家的疑惑。理论与实践的搭配能更好的帮助大家学习,快去试试吧!若想继续学习更多相关知识,请继续关注亿速云网站,小编会继续努力为大家带来更多实用的文章!

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