软件包maven
取决于default-jre-headless (>= 2:1.7) | java7-runtime-headless
(根据sudo dpkg -I /var/cache/apt/archives/maven_3.5.2-2_all.deb
)。我注意到在Docker内部运行的Ubuntu 18.04上的以下行为(image docker:18.04
):
apt-get update && apt-get install --yes openjdk-8-jdk
apt-get install --yes maven
先安装OpenJDK 8 JDK(包括JRE),然后再安装Maven,因为已经提供了JRE。但是两者
apt-get update && apt-get install --yes maven openjdk-8-jdk
和
apt-get update && apt-get install --yes openjdk-8-jdk maven
导致安装OpenJDK 11 JRE,因为它是默认的JRE。为什么不apt-get install
扫描软件包列表以检查是否提供了依赖项?我会走很远,然后说apt-get
通常可以做到这一点,即使我没有找到任何相关信息。
https://gitlab.com/krichter/maven-enforcer-plugin-docker/pipelines/26241321maven-enforcer-plugin
提供了命令和结果的概述(其中的项目需要通过的JDK 8 )。我没有理由相信我的桌面Ubuntu 18.04上的行为是不同的。
我正在寻找对所描述场景的解释,也许正在寻找适应软件包列表解析的配置提示。这对我来说不是问题,我不需要任何解决方法。
在我看来,此行为是次优的,因为更直观的做法是,在同一列表中显式地指定满足包依赖关系的包会覆盖安装隐式默认值的需求。如果要同时安装OpenJDK 8和11,则可以在软件包列表中同时指定两者。也许其他人有这个想法,并提出了增强请求(可能是Debian而非Ubuntu)。我对链接感到高兴。
这可能是apt遍历依赖树的结果。查看maven
包装的详细信息,我们看到:
default-jre-headless(> = 2:1.7)
标准Java或Java兼容的运行时(无头)或
默认提供的java7-runtime-headless虚拟软件包-jre- headless,openjdk-11-jre-headless,openjdk-8-jre-headless
如果openjdk-8-jre-headless
已经安装,则java-7-runtime-headless
满足依赖性,并且apt不需要在那里安装其他任何东西。
另一方面,如果java-7-runtime-headless
未安装任何令人满意的软件,则apt将首先使用default-jre-headless
,因为为安装命名的所有软件包均不满足任何一个依赖关系,并且JDK 11已安装。由于否则满足此依赖关系的软件包会埋在另一个软件包的依赖关系中,因此在创建要安装的软件包列表时,我们会遇到Catch-22。
如果您明确命名提供java7-runtime-headless
安装的软件包之一,则apt将根据需要工作:
# apt-get install --assume-no maven openjdk-8-jre-headless
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following additional packages will be installed:
ca-certificates ca-certificates-java dbus fontconfig-config fonts-dejavu-core
java-common krb5-locales libaopalliance-java libapache-pom-java libapparmor1
libatinject-jsr330-api-java libavahi-client3 libavahi-common-data
libavahi-common3 libbsd0 libcdi-api-java libcommons-cli-java
libcommons-io-java libcommons-lang3-java libcommons-parent-java libcups2
libdbus-1-3 libexpat1 libfontconfig1 libfreetype6
libgeronimo-annotation-1.3-spec-java libgeronimo-interceptor-3.0-spec-java
libgssapi-krb5-2 libguava-java libguice-java libhawtjni-runtime-java
libjansi-java libjansi-native-java libjpeg-turbo8 libjpeg8 libjsr305-java
libk5crypto3 libkeyutils1 libkrb5-3 libkrb5support0 liblcms2-2
libmaven-parent-java libmaven-resolver-java libmaven-shared-utils-java
libmaven3-core-java libnspr4 libnss3 libpcsclite1 libplexus-cipher-java
libplexus-classworlds-java libplexus-component-annotations-java
libplexus-interpolation-java libplexus-sec-dispatcher-java
libplexus-utils2-java libpng16-16 libsisu-inject-java libsisu-plexus-java
libslf4j-java libsqlite3-0 libssl1.1 libwagon-file-java
libwagon-http-shaded-java libwagon-provider-api-java libx11-6 libx11-data
libxau6 libxcb1 libxdmcp6 libxext6 libxi6 libxrender1 libxtst6
multiarch-support openssl ucf x11-common
Suggested packages:
default-dbus-session-bus | dbus-session-bus default-jre
libaopalliance-java-doc libatinject-jsr330-api-java-doc libservlet3.1-java
libcommons-io-java-doc libcommons-lang3-java-doc cups-common krb5-doc
krb5-user libasm-java libcglib-java libjsr305-java-doc liblcms2-utils
libmaven-shared-utils-java-doc liblogback-java pcscd
libplexus-cipher-java-doc libplexus-classworlds-java-doc
libplexus-interpolation-java-doc libplexus-sec-dispatcher-java-doc
libplexus-utils2-java-doc junit4 testng libcommons-logging-java
liblog4j1.2-java libnss-mdns fonts-dejavu-extra fonts-ipafont-gothic
fonts-ipafont-mincho fonts-wqy-microhei fonts-wqy-zenhei fonts-indic
The following NEW packages will be installed:
ca-certificates ca-certificates-java dbus fontconfig-config fonts-dejavu-core
java-common krb5-locales libaopalliance-java libapache-pom-java libapparmor1
libatinject-jsr330-api-java libavahi-client3 libavahi-common-data
libavahi-common3 libbsd0 libcdi-api-java libcommons-cli-java
libcommons-io-java libcommons-lang3-java libcommons-parent-java libcups2
libdbus-1-3 libexpat1 libfontconfig1 libfreetype6
libgeronimo-annotation-1.3-spec-java libgeronimo-interceptor-3.0-spec-java
libgssapi-krb5-2 libguava-java libguice-java libhawtjni-runtime-java
libjansi-java libjansi-native-java libjpeg-turbo8 libjpeg8 libjsr305-java
libk5crypto3 libkeyutils1 libkrb5-3 libkrb5support0 liblcms2-2
libmaven-parent-java libmaven-resolver-java libmaven-shared-utils-java
libmaven3-core-java libnspr4 libnss3 libpcsclite1 libplexus-cipher-java
libplexus-classworlds-java libplexus-component-annotations-java
libplexus-interpolation-java libplexus-sec-dispatcher-java
libplexus-utils2-java libpng16-16 libsisu-inject-java libsisu-plexus-java
libslf4j-java libsqlite3-0 libssl1.1 libwagon-file-java
libwagon-http-shaded-java libwagon-provider-api-java libx11-6 libx11-data
libxau6 libxcb1 libxdmcp6 libxext6 libxi6 libxrender1 libxtst6 maven
multiarch-support openjdk-8-jre-headless openssl ucf x11-common
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