我正在编写 Spring 引导教程,但我有点卡在视频的这一部分。视频中的叙述者在 return 语句中使用了 MaxSizeConfig 导入。尝试同一行时,我收到一条错误消息,指出无法将 MaxSizeConfig 解析为类型。查看 hazelcast 的文档,导入存在。我可以就我的代码做错了什么获得一些指导吗?
这是我的 pom.xml:
<?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>2.5.3</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.stephen.springweb</groupId>
<artifactId>productrestapi</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>productrestapi</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>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-actuator</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-security</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<exclusions>
<exclusion>
<groupId>
org.springframework.boot
</groupId>
<artifactId>
spring-boot-starter-tomcat
</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-cache</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jetty</artifactId>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.hazelcast</groupId>
<artifactId>hazelcast</artifactId>
</dependency>
<dependency>
<groupId>com.hazelcast</groupId>
<artifactId>hazelcast-spring</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<executions>
<execution>
<goals>
<goal>build-info</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
这是尝试使用 MaxSizeConfig 的代码:
package com.stephen.springweb.productrestapi.config;
import org.springframework.context.annotation.Bean;
import com.hazelcast.config.Config;
import com.hazelcast.config.EvictionPolicy;
import com.hazelcast.config.MapConfig;
import com.hazelcast.config.MaxSizePolicy;
import org.springframework.context.annotation.Configuration;
@Configuration
public class ProductCacheConfig {
@Bean
public Config cacheConfig() {
return new Config()
.setInstanceName("hazel-instance")
.addMapConfig(new MapConfig()
.setName("product-cache")
.setTimeToLiveSeconds(3000)
.setMaxSizeConfig(new MaxSizeConfig(200, MaxSizePolicy.FREE_HEAP_SIZE))
.setEvictionPolicy(EvictionPolicy.LRU)
);
}
}
谢谢。
最佳答案
对于版本 4,使用 setEvictionConfig。 https://docs.hazelcast.org/docs/4.0/javadoc/com/hazelcast/config/EvictionConfig.html
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import com.hazelcast.config.Config;
import com.hazelcast.config.EvictionConfig;
import com.hazelcast.config.EvictionPolicy;
import com.hazelcast.config.MapConfig;
import com.hazelcast.config.MaxSizePolicy;
@Configuration
public class ProductCacheConfig {
@Bean
public Config cacheConfig() {
return new Config()
.setInstanceName("hazel-instance")
.addMapConfig(new MapConfig()
.setName("product-cache")
.setTimeToLiveSeconds(3000)
.setEvictionConfig(new EvictionConfig()
.setSize(200)
.setMaxSizePolicy(MaxSizePolicy.FREE_HEAP_SIZE)
.setEvictionPolicy(EvictionPolicy.LRU)
)
);
}
}
关于java - com.hazelcast.config.MaxSizeConfig 的导入问题,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/68925343/