Question

在Java 8和之前的版本中，存在使用支持目录（java.endorsed.dirs）的机制，该目录是覆盖JDK内部实现的库的集合。

如何在Java-9中解决这个问题？被认可的dirs在那里被删除？

Answer 1

在JDK 9中，您可以使用upgradeable modules或将 JAR文件放在类路径上。

java.endorsed.dirs系统属性和lib/endorsed 目录不再存在。 javac编译器和java 如果检测到任何一个，启动器将退出。

如果其中任何一个存在，您最终会发现错误：

<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and
standalone APIs in modular form will be supported via the concept of
upgradeable modules. Error: Could not create the Java Virtual Machine.
Error: A fatal exception has occurred. Program will exit.

这些已通过标准的覆盖机制被删除以获得Modular Run-Time Images，现在将使用模块化图像。

模块化图像由模块而不是JAR文件组成。展望支持转发，认可标准和独立API 只有模块化形式，通过upgradeable modules的概念。

Answer 2

这是一个特定的解决方案，但可能可以一概而论。在系统版本上：macOS 10.14.6（18G3020）内核版本：Darwin 18.7.0我安装了OpenJDK 64位服务器VM（内部版本13.0.2 + 8，混合模式，共享）和java_ee_sdk-8u1。

我在执行xjc时遇到此错误：

[foo@bar bin 14:47:27] sudo ./xjc
-Djava.endorsed.dirs=./../modules/endorsed is not supported. Endorsed standards and standalone APIs
in modular form will be supported via the concept of upgradeable modules.
Error: Could not create the Java Virtual Machine.
Error: A fatal exception has occurred. Program will exit.enter code here

我编辑了~/glassfish5/glassfish/bin/xjc的最后一行以删除-Djava.endorsed.dirs位：之前

exec "$JAVA" -Djava.endorsed.dirs="$AS_INSTALL_LIB/endorsed" -cp "$AS_INSTALL_LIB/webservices-osgi.jar:$AS_INSTALL_LIB/javax.xml.rpc-api.jar:$AS_INSTALL_LIB/jaxb-osgi.jar" com.sun.tools.xjc.Driver "$@"

之后

exec "$JAVA" -cp "$AS_INSTALL_LIB/webservices-osgi.jar:$AS_INSTALL_LIB/javax.xml.rpc-api.jar:$AS_INSTALL_LIB/jaxb-osgi.jar" com.sun.tools.xjc.Driver "$@"

之后~/glassfish5/glassfish/bin/xjc正常工作

Answer 3

I also faced same issue, Java versions higher than 8 are not supported by Tomcat 9.
please check bin/catalina.sh for more information.
#JAVA_ENDORSED_DIRS (Optional) Lists of of colon separated directories
#containing some jars in order to allow replacement of APIs
#created outside of the JCP (i.e. DOM and SAX from W3C).
#It can also be used to update the XML parser implementation.
#This is only supported for Java <= 8.
#Defaults to $CATALINA_HOME/endorsed.

如何替换Java 9中的endorsed目录？

3 个答案: