Java gradle无法获取c3p0依赖项

我试图创建ComboPooledDataSource，它理想地存在于C3P0依赖项中。尽管添加了gradle编译组，并执行了gradle clean构建，但它无法获取与c3p0相关的JAR。下面是build.gradle文件

    plugins {
        id 'org.springframework.boot' version '2.2.0.RELEASE'
        id 'io.spring.dependency-management' version '1.0.8.RELEASE'
        id 'java'
    }

    group = 'com.xyz.abc'
    version = '0.0.1-SNAPSHOT'
    sourceCompatibility = '1.8'

    configurations {
        developmentOnly
        runtimeClasspath {
            extendsFrom developmentOnly
        }
    }

    sourceSets {
        main {
            java {
                srcDir 'src'
            }
        }
    }

    repositories {
        mavenCentral()
    }

    ext {
        set('springCloudVersion', "Hoxton.RELEASE")
    }

    dependencies {
        implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
        implementation 'org.springframework.boot:spring-boot-starter-web'
        implementation 'org.springframework.boot:spring-boot-starter-web-services'
        compile group: 'org.hibernate', name: 'hibernate-core', version: '5.2.10.Final'
        compile group: 'org.hibernate', name: 'hibernate-c3p0', version: '5.2.10.Final'
        compile group: 'com.mchange', name: 'c3p0', version: '0.9.5.2'
        runtimeOnly 'mysql:mysql-connector-java'
        testImplementation('org.springframework.boot:spring-boot-starter-test') {
            exclude group: 'org.junit.vintage', module: 'junit-vintage-engine'
        }
        testImplementation 'org.springframework.amqp:spring-rabbit-test'
        testImplementation 'org.springframework.security:spring-security-test'
        testCompile 'junit:junit:4.12'
        compile 'junit:junit:4.12'
    }

    dependencyManagement {
        imports {
            mavenBom "org.springframework.cloud:spring-cloud dependencies:${springCloudVersion}"
        }
    }   
    test {
        useJUnitPlatform()
    }

---

您是否尝试过使用gradle

build--refresh dependencies

并查看它是否能够下载。此外，如果您在一家需要从中央回购协议下载依赖项的公司工作，请检查该依赖项的版本是否为Presenties，我已尝试执行该版本。再也没有运气了！