调试过程中大写字母与大写字母环境var名称

Question

在调试与启动会话期间，以下不同行为可能导致什么情况？

在eclipse-debug和maven-run中，我在Eclipse中运行时获取所有大写的环境变量，其中一些保持在windows中定义的状态。

@Test 
public void testEnvironmentVariables() { 
    ArrayList<String> keys = new ArrayList<>(System.getenv().keySet()); 
    Collections.sort(keys); 
    System.out.println(keys); 
} 

如果由运行执行的输出：注意到http.proxyUser

[=::, ALLUSERSPROFILE, APPDATA, APR_ICONV_PATH, CLASSPATH, CLINK_DIR, COMPUTERNAME, ChocolateyBinRoot, ChocolateyInstall, ComSpec, CommonProgramFiles, CommonProgramFiles(x86), CommonProgramW6432, DEBUG_PORT, DEFLOGDIR, EC_COMPUTER_OU, EC_HOMEAPPDATA, EC_USER_DEPARTMENT, EC_USER_DG, EC_USER_DISPLAY_NAME, EC_USER_ELK, EC_USER_OU, EXTRA_JAVA_PROPERTIES, FP_NO_HOST_CHECK, GRADLE_HOME, HOMEDRIVE, HOMEPATH, JAVA_HOME, JAVA_OPTS, LDMS_LOCAL_DIR, LOCALAPPDATA, LOGONSERVER, LocalRunSetup, M2, M2_HOME, M2_REPO, MAVEN_OPTS, MW_HOME, NUMBER_OF_PROCESSORS, ORACLE_BASE, ORACLE_HOME, OS, PATH2, PATHEXT, PROCESSOR_ARCHITECTURE, PROCESSOR_IDENTIFIER, PROCESSOR_LEVEL, PROCESSOR_REVISION, PSModulePath, PUBLIC, Path, ProgramData, ProgramFiles, ProgramFiles(x86), ProgramW6432, SBT_HOME, SESSIONNAME, SFT_SOFTGRIDSERVER, SystemDrive, SystemRoot, TEMP, TMP, USERDNSDOMAIN, USERDOMAIN, USERDOMAIN_ROAMINGPROFILE, USERNAME, USERPROFILE, UUMDS_CFG, VAGRANT_HOME, VBOX_MSI_INSTALL_PATH, VSEDEFLOGDIR, chocolatey_bin_root, debugFlag, http.proxyHost, http.proxyPassword, http.proxyPort, http.proxyUser, http_proxy, https.proxyHost, https.proxyPassword, https.proxyPort, https.proxyUser, https_proxy, myProxy, no_proxy, uumds.config.location, windir, windows_tracing_flags, windows_tracing_logfile]

输出如果由调试执行：通知HTTP.PROXYUSER

[ALLUSERSPROFILE, APPDATA, APR_ICONV_PATH, CHOCOLATEYBINROOT, CHOCOLATEYINSTALL, CHOCOLATEY_BIN_ROOT, CLASSPATH, CLINK_DIR, COMMONPROGRAMFILES, COMMONPROGRAMFILES(X86), COMMONPROGRAMW6432, COMPUTERNAME, COMSPEC, DEBUGFLAG, DEBUG_PORT, DEFLOGDIR, EC_COMPUTER_OU, EC_HOMEAPPDATA, EC_USER_DEPARTMENT, EC_USER_DG, EC_USER_DISPLAY_NAME, EC_USER_ELK, EC_USER_OU, EXTRA_JAVA_PROPERTIES, FP_NO_HOST_CHECK, GRADLE_HOME, HOMEDRIVE, HOMEPATH, HTTP.PROXYHOST, HTTP.PROXYPASSWORD, HTTP.PROXYPORT, HTTP.PROXYUSER, HTTPS.PROXYHOST, HTTPS.PROXYPASSWORD, HTTPS.PROXYPORT, HTTPS.PROXYUSER, HTTPS_PROXY, HTTP_PROXY, JAVA_HOME, JAVA_OPTS, LDMS_LOCAL_DIR, LOCALAPPDATA, LOCALRUNSETUP, LOGONSERVER, M2, M2_HOME, M2_REPO, MAVEN_OPTS, MW_HOME, MYPROXY, NO_PROXY, NUMBER_OF_PROCESSORS, ORACLE_BASE, ORACLE_HOME, OS, PATH, PATH2, PATHEXT, PROCESSOR_ARCHITECTURE, PROCESSOR_IDENTIFIER, PROCESSOR_LEVEL, PROCESSOR_REVISION, PROGRAMDATA, PROGRAMFILES, PROGRAMFILES(X86), PROGRAMW6432, PROMPT, PSMODULEPATH, PUBLIC, SBT_HOME, SESSIONNAME, SFT_SOFTGRIDSERVER, SYSTEMDRIVE, SYSTEMROOT, TEMP, TMP, USERDNSDOMAIN, USERDOMAIN, USERDOMAIN_ROAMINGPROFILE, USERNAME, USERPROFILE, UUMDS.CONFIG.LOCATION, UUMDS_CFG, VAGRANT_HOME, VBOX_MSI_INSTALL_PATH, VSEDEFLOGDIR, WINDIR, WINDOWS_TRACING_FLAGS, WINDOWS_TRACING_LOGFILE]

如果从行家执行：注意HTTP.PROXYUSER testEnvironment=[=::, =C:, =EXITCODE, ALLUSERSPROFILE, APPDATA, APR_ICONV_PATH, CHOCOLATEYBINROOT, CHOCOLATEYINSTALL, CHOCOLATEY_BIN_ROOT, CLASSPATH, CLASSWORLDS_JAR, CLASSWORLDS_LAUNCHER, CLINK_DIR, COMMANDER_DRIVE, COMMANDER_EXE, COMMANDER_INI, COMMANDER_PATH, COMMONPROGRAMFILES, COMMONPROGRAMFILES(X86), COMMONPROGRAMW6432, COMPUTERNAME, COMSPEC, DEBUGFLAG, DEBUG_PORT, DEFLOGDIR, EC_COMPUTER_OU, EC_HOMEAPPDATA, EC_USER_DEPARTMENT, EC_USER_DG, EC_USER_DISPLAY_NAME, EC_USER_ELK, EC_USER_OU, ERROR_CODE, EXEC_DIR, EXTRA_JAVA_PROPERTIES, FP_NO_HOST_CHECK, GRADLE_HOME, HOME, HOMEDRIVE, HOMEPATH, HTTP.PROXYHOST, HTTP.PROXYPASSWORD, HTTP.PROXYPORT, HTTP.PROXYUSER, HTTPS.PROXYHOST, HTTPS.PROXYPASSWORD, HTTPS.PROXYPORT, HTTPS.PROXYUSER, HTTPS_PROXY, HTTP_PROXY, JAVA_HOME, JAVA_OPTS, LDMS_LOCAL_DIR, LOCALAPPDATA, LOCALRUNSETUP, LOGONSERVER, M2, M2_HOME, M2_REPO, MAVEN_CMD_LINE_ARGS, MAVEN_JAVA_EXE, MAVEN_OPTS, MAVEN_PROJECTBASEDIR, MW_HOME, MYPROXY, NO_PROXY, NUMBER_OF_PROCESSORS, ORACLE_BASE, ORACLE_HOME, OS, PATH, PATH2, PATHEXT, PROCESSOR_ARCHITECTURE, PROCESSOR_IDENTIFIER, PROCESSOR_LEVEL, PROCESSOR_REVISION, PROGRAMDATA, PROGRAMFILES, PROGRAMFILES(X86), PROGRAMW6432, PROMPT, PSMODULEPATH, PUBLIC, SBT_HOME, SESSIONNAME, SFT_SOFTGRIDSERVER, SYSTEMDRIVE, SYSTEMROOT, TEMP, TMP, USERDNSDOMAIN, USERDOMAIN, USERDOMAIN_ROAMINGPROFILE, USERNAME, USERPROFILE, UUMDS.CONFIG.LOCATION, UUMDS_CFG, VAGRANT_HOME, VBOX_MSI_INSTALL_PATH, VSEDEFLOGDIR, WDIR, WINDIR, WINDOWS_TRACING_FLAGS, WINDOWS_TRACING_LOGFILE]

我发现了一个类似的问题在这里：https://www.eclipse.org/forums/index.php?t=msg&th=77986&goto=242568&#msg_242568但没有任何回答。

我使用java8的windows7上和eclipse氖

>java -version 
java version "1.8.0_77" 
Java(TM) SE Runtime Environment (build 1.8.0_77-b03) 
Java HotSpot(TM) 64-Bit Server VM (build 25.77-b03, mixed mode) 

Eclipse Java EE IDE for Web Developers 
Version: Neon Release (4.6.0) 
Build id: 20160613-1800 

> mvn -version 
Apache Maven 3.3.3 (7994120775791599e205a5524ec3e0dfe41d4a06; 2015-04-22T13:57:37+02:00) 
Maven home: C:\costin\apps\apache-maven-3.3.3 
Java version: 1.8.0_77, vendor: Oracle Corporation 
Java home: C:\Program Files\Java\jdk1.8.0_77\jre 
Default locale: en_GB, platform encoding: Cp1252 
OS name: "windows 7", version: "6.1", arch: "amd64", family: "dos" 

Answer 1

您使用JPDA不进行调试。使用JPDA，你会看到与System中使用的完全相同的HashMap。您必须使用两个不同的vm执行，因为这些键的顺序不同，这不是100％的java调试。

在两个不同的进程中，可以通过在environment-variables之前使用system-properties来执行不同的执行命令。