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Posted to commits@servicecomb.apache.org by GitBox <gi...@apache.org> on 2019/12/29 10:18:59 UTC
[GitHub] [servicecomb-java-chassis] mf1632015 opened a new issue #1502: JDK12demo启动报错：NullPointerException，换回JDK8没问题。
mf1632015 opened a new issue #1502: JDK12demo启动报错：NullPointerException，换回JDK8没问题。
URL: https://github.com/apache/servicecomb-java-chassis/issues/1502
JDK12 启动java-chassis-demo里面的所有的例子，无论是provider还是consumer都会报空指针异常，经过排查发现，下面的代码处，常量MODIFIERS_FIELD是null。我怀疑，JDK12的Field类已经不能获得它的成员变量了。我也试了下，Field.getDeclaredFields()返回的是一个空数组。
错误异常截图如下：
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[GitHub] [servicecomb-java-chassis] WillemJiang commented on issue #1502: JDK12demo启动报错：NullPointerException，换回JDK8没问题。
Posted by GitBox <gi...@apache.org>.
WillemJiang commented on issue #1502: JDK12demo启动报错：NullPointerException，换回JDK8没问题。
URL: https://github.com/apache/servicecomb-java-chassis/issues/1502#issuecomment-569565297
JDK11 是一个长期支持版本。 https://www.oracle.com/technetwork/java/java-se-support-roadmap.html
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[GitHub] [servicecomb-java-chassis] mf1632015 commented on issue #1502: JDK12demo启动报错：NullPointerException，换回JDK8没问题。
Posted by GitBox <gi...@apache.org>.
mf1632015 commented on issue #1502: JDK12demo启动报错：NullPointerException，换回JDK8没问题。
URL: https://github.com/apache/servicecomb-java-chassis/issues/1502#issuecomment-569492319
图片上传失败了，报空指针异常的位置位于org.apache.servicecomb.foundation.common.utils.ReflectUtils#MODIFIERS_FIELD
static {
MODIFIERS_FIELD.setAccessible(true);
}
异常信息没有保存，就是上图的MODIFIERS_FIELD是空指针，如果从源代码看的话，就是JDK12的Field这个反射类没办法继续反射了。Field.class.getDeclaredFields()是个空数组
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[GitHub] [servicecomb-java-chassis] liubao68 commented on issue #1502: JDK12demo启动报错：NullPointerException，换回JDK8没问题。
Posted by GitBox <gi...@apache.org>.
liubao68 commented on issue #1502: JDK12demo启动报错：NullPointerException，换回JDK8没问题。
URL: https://github.com/apache/servicecomb-java-chassis/issues/1502#issuecomment-589460853
JDK 12 为了安全性， 所有破坏对象封装性的的操作都是不允许的了。 目前 java-chassis 还有部分特性以及一些三方件还使用这些特性，无法运行于 JDK 12。 发布的 2.0.0 版本已经可以在 JDK 11运行， 目前 JDK 11 是 JAVA 的 TLS 版本，建议优先采用这个版本。
这个问题先关闭， 相关JDK 封装特性的修改已经创建 apache 任务， java-chassis 需要在后续版本支持 JDK 12及其以上版本。
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[GitHub] [servicecomb-java-chassis] liubao68 closed issue #1502: JDK12demo启动报错：NullPointerException，换回JDK8没问题。
Posted by GitBox <gi...@apache.org>.
liubao68 closed issue #1502: JDK12demo启动报错：NullPointerException，换回JDK8没问题。
URL: https://github.com/apache/servicecomb-java-chassis/issues/1502
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[GitHub] [servicecomb-java-chassis] liubao68 edited a comment on issue #1502: JDK12demo启动报错：NullPointerException，换回JDK8没问题。
Posted by GitBox <gi...@apache.org>.
liubao68 edited a comment on issue #1502: JDK12demo启动报错：NullPointerException，换回JDK8没问题。
URL: https://github.com/apache/servicecomb-java-chassis/issues/1502#issuecomment-589460853
JDK 12 为了安全性， 所有破坏对象封装性的的操作都是不允许的了。 目前 java-chassis 还有部分特性以及一些三方件还使用这些特性，无法运行于 JDK 12。 发布的 2.0.0 版本已经可以在 JDK 11运行， 目前 JDK 11 是 JAVA 的 TLS 版本，建议优先采用这个版本。
这个问题先关闭， 相关JDK 封装特性的修改已经创建 apache 任务， java-chassis 需要在后续版本支持 JDK 12及其以上版本。
BTW： 本 issue 涉及的问题 2.0.0 也已经修复，上面说的是理论情况。 但是没验证 JDK 12， 只验证了 JDK 11, JDK 12 限制比 JDK 11更加严格。
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[GitHub] [servicecomb-java-chassis] WillemJiang commented on issue #1502: JDK12demo启动报错：NullPointerException，换回JDK8没问题。
Posted by GitBox <gi...@apache.org>.
WillemJiang commented on issue #1502: JDK12demo启动报错：NullPointerException，换回JDK8没问题。
URL: https://github.com/apache/servicecomb-java-chassis/issues/1502#issuecomment-569563677
@liubao68 我觉得是时候考虑一下支持jdk11了。
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[GitHub] [servicecomb-java-chassis] liubao68 commented on issue #1502: JDK12demo启动报错：NullPointerException，换回JDK8没问题。
Posted by GitBox <gi...@apache.org>.
liubao68 commented on issue #1502: JDK12demo启动报错：NullPointerException，换回JDK8没问题。
URL: https://github.com/apache/servicecomb-java-chassis/issues/1502#issuecomment-569562800
JDK9以上有很多不兼容特性。java-chassis暂时还没有针对以上版本进行适配和测试。
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[GitHub] [servicecomb-java-chassis] zhfeng commented on issue #1502: JDK12demo启动报错：NullPointerException，换回JDK8没问题。
Posted by GitBox <gi...@apache.org>.
zhfeng commented on issue #1502: JDK12demo启动报错：NullPointerException，换回JDK8没问题。
URL: https://github.com/apache/servicecomb-java-chassis/issues/1502#issuecomment-569563786
https://stackoverflow.com/questions/56039341/get-declared-fields-of-java-lang-reflect-fields-in-jdk12
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[GitHub] [servicecomb-java-chassis] zhfeng commented on issue #1502: JDK12demo启动报错：NullPointerException，换回JDK8没问题。
Posted by GitBox <gi...@apache.org>.
zhfeng commented on issue #1502: JDK12demo启动报错：NullPointerException，换回JDK8没问题。
URL: https://github.com/apache/servicecomb-java-chassis/issues/1502#issuecomment-569563855
@WillemJiang jdk11 有LTS的版本吗？
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[GitHub] [servicecomb-java-chassis] mf1632015 commented on issue #1502: JDK12demo启动报错：NullPointerException，换回JDK8没问题。
Posted by GitBox <gi...@apache.org>.
mf1632015 commented on issue #1502: JDK12demo启动报错：NullPointerException，换回JDK8没问题。
URL: https://github.com/apache/servicecomb-java-chassis/issues/1502#issuecomment-569493055
沟通了组内的大牛，他怀疑是java的默认安全级别提升了。不过jdk12已经被我卸载了，我有机会复现下看看。
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