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這篇文章主要介紹“Spring boot應(yīng)用啟動(dòng)后首次訪問很慢怎么解決”,在日常操作中,相信很多人在Spring boot應(yīng)用啟動(dòng)后首次訪問很慢怎么解決問題上存在疑惑,小編查閱了各式資料,整理出簡(jiǎn)單好用的操作方法,希望對(duì)大家解答”Spring boot應(yīng)用啟動(dòng)后首次訪問很慢怎么解決”的疑惑有所幫助!接下來,請(qǐng)跟著小編一起來學(xué)習(xí)吧!
CentOS7
JDK1.8
應(yīng)用是Spring boot框架的(內(nèi)嵌式tomcat)jar文件
通過命令:nohup java -jar XXXX.jar & 啟動(dòng)項(xiàng)目后瀏覽器訪問響應(yīng)十分的緩慢,網(wǎng)頁圖片和css等靜態(tài)資源加載的十分緩慢(網(wǎng)站登錄更是需要好幾分鐘才能完全加載完畢)。
然后在Google瀏覽器搜索了一下(已翻墻),搜索需用英文,類似問題看來不是個(gè)例呀,甚至JDK bug列表匯中就有相似的bug,如JDK-6521844 : SecureRandom hangs on Linux Systems,但這些bug都標(biāo)記為fixed。但明顯沒有完全fix掉啊。然后繼續(xù)找,原來
Avoiding JVM Delays Caused by Random Number Generation
正好記錄了這個(gè)隨機(jī)數(shù)生成慢的原因和解決方案。Java隨機(jī)數(shù)生成依賴熵源(Entropy Source),默認(rèn)的阻塞型的 /dev/random熵源可能導(dǎo)致阻塞,而換一個(gè)非阻塞的 /dev/urandom的熵源就可以了。
進(jìn)入你的JAVA_HOME的jre目錄下找到并vim編輯這個(gè)文件:
$JAVA_HOME/jre/lib/security/java.security
找到:
securerandom.source=file:/dev/random 這一行
改之前:
securerandom.source=file:/dev/random
改為:
securerandom.source=file:/dev/urandom
然后保存修改就OK了!
spring boot 啟動(dòng)的服務(wù)靜態(tài)資源非常慢,慢到無法忍受。
排查過程 一
1. 在filter 中記錄請(qǐng)求時(shí)間 ,得到某些靜態(tài)資源居然600ms,但是主要問題不在這里,是客戶端的連接被阻塞了。如上圖
2. 然后然后禁用filter(直接spring boot static) 返回
3. 結(jié)果還是很慢
排查過程 二
1. 開啟客戶端資源 GZIP
2. 手動(dòng)設(shè)置cache-contro
結(jié)果還是很慢,我就很疑惑了,難道是選用的資源有問題,看著也很正常。
于是我就把資源都放到 python flask??! 結(jié)果比java的快了好幾倍。。 瞬間我人就蒙了。
然后仔細(xì)看application.xml 配置,其實(shí)當(dāng)時(shí)也沒設(shè)置什么東西 ,于是一項(xiàng)一項(xiàng)的注釋,效率上還是沒變化,我就試了試新建一個(gè)項(xiàng)目,然后把 html 都拿過去。
問題解決了!! 速度 非常快
好家伙,我直接好家伙,我查了幾天的問題,居然可能是在依賴上。
有空再去看看2.3.4 的 底層tomcat配置有什么不同
<?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> <!--熱部署--> <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>
<?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> <!--熱部署--> <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,關(guān)于“Spring boot應(yīng)用啟動(dòng)后首次訪問很慢怎么解決”的學(xué)習(xí)就結(jié)束了,希望能夠解決大家的疑惑。理論與實(shí)踐的搭配能更好的幫助大家學(xué)習(xí),快去試試吧!若想繼續(xù)學(xué)習(xí)更多相關(guān)知識(shí),請(qǐng)繼續(xù)關(guān)注億速云網(wǎng)站,小編會(huì)繼續(xù)努力為大家?guī)砀鄬?shí)用的文章!
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