10009 jdk环境搭建

卸载

查看已经安装的jdk

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[root@bogon jre]# rpm -qa|grep jdk
java-1.8.0-openjdk-headless-1.8.0.65-3.b17.el7.x86_64
java-1.7.0-openjdk-1.7.0.91-2.6.2.3.el7.x86_64
java-1.7.0-openjdk-headless-1.7.0.91-2.6.2.3.el7.x86_64
java-1.8.0-openjdk-1.8.0.65-3.b17.el7.x86_6412345

卸载命令

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[root@bogon jre]# yum -y remove java-1.8.0-openjdk-headless-1.8.0.65-3.b17.el7.x86_641

卸载完成之后Java命令不被识别

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[root@bogon lib]# java -version
bash: java: command not found...12

安装

去官网下载jdk：http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html
解压到安装目录

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[root@bogon software]# tar -zxvf jdk-8u101-linux-x64.tar.gz -C /usr/local/java/

安装完毕之后在/etc/profile文件末尾添加

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[root@bogon software]# vim /etc/profile
export JAVA_HOME=/usr/local/java/jdk1.8.0_181
export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
export PATH=${JAVA_HOME}/bin:$PATH

使/etc/profile生效

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[root@bogon jdk1.8.0_101]# source /etc/profile

检测安装是否成功

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[root@bogon jdk1.8.0_101]# java -version
java version "1.8.0_101"
Java(TM) SE Runtime Environment (build 1.8.0_101-b13)
Java HotSpot(TM) 64-Bit Server VM (build 25.101-b13, mixed mode)
[root@bogon jdk1.8.0_101]# javac
Usage: javac <options> <source files>
where possible options include:
  -g                         Generate all debugging info
  -g:none                    Generate no debugging info
  -g:{lines,vars,source}     Generate only some debugging info
  -nowarn                    Generate no warnings
  -verbose                   Output messages about what the compiler is doing
  -deprecation               Output source locations where deprecated APIs are used
  -classpath <path>          Specify where to find user class files and annotation processors
  -cp <path>                 Specify where to find user class files and annotation processors
  -sourcepath <path>         Specify where to find input source files
  -bootclasspath <path>      Override location of bootstrap class files
  -extdirs <dirs>            Override location of installed extensions
  -endorseddirs <dirs>       Override location of endorsed standards path
  -proc:{none,only}          Control whether annotation processing and/or compilation is done.
  -processor <class1>[,<class2>,<class3>...] Names of the annotation processors to run; bypasses default discovery process
  -processorpath <path>      Specify where to find annotation processors
  -parameters                Generate metadata for reflection on method parameters
  -d <directory>             Specify where to place generated class files
  -s <directory>             Specify where to place generated source files
  -h <directory>             Specify where to place generated native header files
  -implicit:{none,class}     Specify whether or not to generate class files for implicitly referenced files
  -encoding <encoding>       Specify character encoding used by source files
  -source <release>          Provide source compatibility with specified release
  -target <release>          Generate class files for specific VM version
  -profile <profile>         Check that API used is available in the specified profile
  -version                   Version information
  -help                      Print a synopsis of standard options
  -Akey[=value]              Options to pass to annotation processors
  -X                         Print a synopsis of nonstandard options
  -J<flag>                   Pass <flag> directly to the runtime system
  -Werror                    Terminate compilation if warnings occur
  @<filename>                Read options and filenames from file

https://www.cnblogs.com/zhongkaiuu/p/BC.html
问题：JCE cannot authenticate the provider BC

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1. 找到 java.security 在jvm安装地方 /path_to_your_jvm/jre/lib/security
security.provider.9=org.bouncycastle.jce.provider.BouncyCastleProvider
3. 添加 bcprov-jdk16-146.jar到 /path_to_your_jvm/jre/lib/ext （提供maven的地址）

如

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[webadmin@wenhuatest2250 security]$ pwd
/usr/local/jdk1.6.0_45/jre/lib/security
[webadmin@wenhuatest2250 security]$ ll
total 116
-rw-r--r--. 1 webadmin webadmin  2177 Mar 27  2013 blacklist
-rw-r--r--. 1 webadmin webadmin 81202 Mar 27  2013 cacerts
-rw-r--r--. 1 webadmin webadmin  2253 Mar 27  2013 java.policy
-rw-r--r--. 1 webadmin webadmin 13481 Jul 31 18:15 java.security
-rw-r--r--. 1 webadmin webadmin   109 Mar 27  2013 javaws.policy
-rw-r--r--. 1 webadmin webadmin  2940 Mar 27  2013 local_policy.jar
-rw-r--r--. 1 webadmin webadmin     0 Mar 27  2013 trusted.libraries
-rw-r--r--. 1 webadmin webadmin  2469 Mar 27  2013 US_export_policy.jar
[webadmin@wenhuatest2250 security]$ stat java.security 
  File: ‘java.security’
  Size: 13481           Blocks: 32         IO Block: 4096   regular file
Device: fd01h/64769d    Inode: 6508959     Links: 1
Access: (0644/-rw-r--r--)  Uid: ( 1000/webadmin)   Gid: ( 1000/webadmin)
Context: unconfined_u:object_r:usr_t:s0
Access: 2019-08-22 09:15:39.110675245 +0800
Modify: 2019-07-31 18:15:20.880153567 +0800
Change: 2019-07-31 18:15:20.904165564 +0800
 Birth: -
 
 [webadmin@wenhuatest2250 ext]$ pwd
/usr/local/jdk1.6.0_45/jre/lib/ext
[webadmin@wenhuatest2250 ext]$ ll
total 3192
-rw-r--r--. 1 webadmin webadmin 1997327 Jul 31 17:43 bcprov-jdk15on-1.47.jar
-rw-r--r--. 1 webadmin webadmin    8238 Mar 27  2013 dnsns.jar
-rw-r--r--. 1 webadmin webadmin  845352 Jul  8 16:36 localedata.jar
-rw-r--r--. 1 webadmin webadmin     429 Mar 27  2013 meta-index
-rw-r--r--. 1 webadmin webadmin  170315 Mar 27  2013 sunjce_provider.jar
-rw-r--r--. 1 webadmin webadmin  232338 Mar 27  2013 sunpkcs11.jar

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