項目從Java 6遷移到OpenJDK8

Question

我工作的項目（在工作中）是用Java編寫的，並使用Java 6.我們正在嘗試遷移到OpenJDK8。 我們必須使用Eclipse Indigo（它是項目的一部分）。 在閱讀了一些以前的線程后，我遵循了如何遷移的步驟。 我遵循的步驟：

1. 轉到Windows -> Preferences -> Java -> Installed JRE's 。 在那里我點擊add並選擇已安裝的1.8.0 Java的路徑。
2. 然后我去了Project -> Properties -> Java Build Path -> Libraries 。 在那里，我選擇JRE System Library並單擊edit 。 在Alternate JRE我選擇1.8.0 。
3. 然后我去了Build -> External tools configuration -> JRE 。 在Separate JRE部分中，我選擇1.8.0 。

然后我在打開的Java文件中收到錯誤（未編譯或運行時錯誤 - 只是帶有紅色標記的eclipse顯示）:(第二步后發生錯誤）

The type java.lang.CharSequence cannot be resolved. It is indirectly referenced from required .class files

部分代碼：

final String arg = getOption(ArgNames.JOB);
if (arg.contains("~~")) {
    return arg.split("~~")[1];
} else {
    return arg;
}

它說錯誤是因為arg.contains("~~") 。 我已經閱讀了有關該錯誤的所有先前的線程，但他們建議回到舊的Java版本（雖然我們想轉向OpenJDK8）。 我試圖構建它實際上沒有任何編譯錯誤。 我不確定我是否應該高興或悲傷，因為我不確定我是否真的使用OpenJDK8正確構建它。 總結一下，我會試着提出一些直接的問題：

1. 如何驗證我是否使用正確的版本構建它？
2. 我應該如何確保所有功能都像Java 6 ？
3. 如何解決我指出的Eclipse紅色標記錯誤？

編輯 ：我點擊restart重啟Eclipse，現在當我嘗試構建它時，它失敗了。 日志文件的第一部分如下所示：

!SESSION 2019-04-18 18:45:36.356 -----------------------------------------------
eclipse.buildId=M20120208-0800
java.version=1.8.0
java.vendor=Oracle Corporation
BootLoader constants: OS=linux, ARCH=x86_64, WS=gtk, NL=en_US
Framework arguments:  -application org.eclipse.ant.core.antRunner -buildfile tools/eclipse3.7.1-x86_64/plugins/org.eclipse.build_3.7.0.v20111116-2009//scripts/productBuild/productBuild.xml -Dtimestamp=2010
Command-line arguments:  -application org.eclipse.ant.core.antRunner -buildfile tools/eclipse3.7.1-x86_64/plugins/org.eclipse.build_3.7.0.v20111116-2009//scripts/productBuild/productBuild.xml -Dtimestamp=2010

!ENTRY org.eclipse.osgi 4 0 2019-04-18 18:45:53.567
!MESSAGE Application error
!STACK 1
java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:483)
    at org.eclipse.ant.core.AntRunner.run(AntRunner.java:513)
    at org.eclipse.ant.core.AntRunner.start(AntRunner.java:600)
    at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
    at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
    at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
    at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:344)
    at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:483)
    at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:622)
    at org.eclipse.equinox.launcher.Main.basicRun(Main.java:577)
    at org.eclipse.equinox.launcher.Main.run(Main.java:1410)
    at org.eclipse.equinox.launcher.Main.main(Main.java:1386)
Caused by: tools/eclipse3.7.1-x86_64/plugins/org.eclipse.build_3.7.0.v20111116-2009/scripts/productBuild/productBuild.xml:43: The following error occurred while executing this line:
tools/eclipse3.7.1-x86_64/plugins/org.eclipse.build_3.7.0.v20111116-2009/scripts/build.xml:105: The following error occurred while executing this line:
tools/eclipse3.7.1-x86_64/plugins/org.eclipse.build_3.7.0.v20111116-2009/templates/headless-build/customTargets.xml:12: The following error occurred while executing this line:
tools/eclipse3.7.1-x86_64/plugins/org.eclipse.build_3.7.0.v20111116-2009/scripts/productBuild/allElements.xml:20: The following error occurred while executing this line:
tools/eclipse3.7.1-x86_64/plugins/org.eclipse.build_3.7.0.v20111116-2009/scripts/genericTargets.xml:118: The following error occurred while executing this line:
tools/eclipse3.7.1-x86_64/plugins/org.eclipse.build_3.7.0.v20111116-2009/scripts/genericTargets.xml:123: The following error occurred while executing this line:
tools/workspace/buildFiles/features/org.eclipse.build.container.feature/build.xml:30: The following error occurred while executing this line:
tools/workspace/buildFiles/features/org.eclipse.build.container.feature/build.xml:16: The following error occurred while executing this line:
tools/workspace/buildFiles/features/com.feature/build.xml:278: The following error occurred while executing this line:
tools/workspace/buildFiles/features/com.feature/build.xml:109: The following error occurred while executing this line:
tools/workspace/buildFiles/plugins/com.testmanagement/build.xml:235: The following error occurred while executing this line:
tools/workspace/buildFiles/plugins/com.testmanagement/build.xml:196: Compile failed; see the compiler error output for details.

我猜有些功能失敗了。 我知道Sun類在版本8中已經改變了。也許是因為這個原因？

編輯2：從之前的主題我已經了解到Eclipse Indiago與Java 8不兼容。所以我轉向了Luna。 但是大多數文件現在都失敗了，因為我的項目使用了Indiago。 一些錯誤：

The import org.eclipse cannot be resolved
The import org.osgi cannot be resolved
The import junit cannot be resolved

如何解決這些錯誤？

編輯3：據我所知，Indigo不支持Java 8.所以我轉向了Luna。 但現在每個插件都失敗了。 Windows -> Preferences -> Plug-in Development -> Target Platform -> Running Platform -> edit中沒有一堆路徑Windows -> Preferences -> Plug-in Development -> Target Platform -> Running Platform -> edit 。 該項目使用Indigo而不是Luna，因此路徑不存在：

./.metadata/.log:!MESSAGE File does not exist: tools/eclipse/4.4/plugins/org.eclipse.ui.presentations.r21.source_3.2.200.I20100517-1500.jar
./.metadata/.log:!MESSAGE File does not exist: tools/eclipse/4.4/plugins/org.eclipse.ui.source_3.7.0.v20110928-1505.jar
./.metadata/.log:!MESSAGE File does not exist: tools/eclipse/4.4/plugins/org.eclipse.ui.views.log.source_1.0.200.v20110404.jar
./.metadata/.log:!MESSAGE File does not exist: tools/eclipse/4.4/plugins/org.eclipse.ui.views.properties.tabbed.source_3.5.200.v20110928-1505.jar
./.metadata/.log:!MESSAGE File does not exist: tools/eclipse/4.4/plugins/org.eclipse.ui.views.source_3.6.0.v20110928-1505.jar
./.metadata/.log:!MESSAGE File does not exist: tools/eclipse/4.4/plugins/org.eclipse.ui.workbench.compatibility.source_3.2.100.I20110413-1600.jar
./.metadata/.log:!MESSAGE File does not exist: tools/eclipse/4.4/plugins/org.eclipse.ui.workbench.source_3.7.1.v20120104-1859.jar
./.metadata/.log:!MESSAGE File does not exist: tools/eclipse/4.4/plugins/org.eclipse.ui.workbench.texteditor.source_3.7.0.v20110928-1504.jar
./.metadata/.log:!MESSAGE File does not exist: tools/eclipse/4.4/plugins/org.eclipse.update.configurator.source_3.3.100.v20100512.jar
./.metadata/.log:!MESSAGE File does not exist: tools/eclipse/4.4/plugins/org.eclipse.update.core.source_3.2.500.v20110330.jar
./.metadata/.log:!MESSAGE File does not exist: tools/eclipse/4.4/plugins/org.eclipse.update.scheduler.source_3.2.300.v20100512.jar
./.metadata/.log:!MESSAGE File does not exist: tools/eclipse/4.4/plugins/org.eclipse.update.ui.source_3.2.300.v20100512.jar
./.metadata/.log:!MESSAGE File does not exist: tools/eclipse/4.4/plugins/org.hamcrest.core.source_1.1.0.v20090501071000.jar
./.metadata/.log:!MESSAGE File does not exist: tools/eclipse/4.4/plugins/org.hamcrest.integration.source_1.1.0.v20090501071000.jar
./.metadata/.log:!MESSAGE File does not exist: tools/eclipse/4.4/plugins/org.hamcrest.library.source_1.1.0.v20090501071000.jar
./.metadata/.log:!MESSAGE File does not exist: tools/eclipse/4.4/plugins/org.hamcrest.text.source_1.1.0.v20090501071000.jar
./.metadata/.log:!MESSAGE File does not exist: tools/eclipse/4.4/plugins/org.junit.source_3.8.2.v3_8_2_v20100427-1100.jar
./.metadata/.log:!MESSAGE File does not exist: tools/eclipse/4.4/plugins/org.junit.source_4.8.2.v4_8_2_v20110321-1705.jar
./.metadata/.log:!MESSAGE File does not exist: tools/eclipse/4.4/plugins/org.mortbay.jetty.server.source_6.1.23.v201012071420.jar
./.metadata/.log:!MESSAGE File does not exist: tools/eclipse/4.4/plugins/org.mortbay.jetty.util.source_6.1.23.v201012071420.jar
./.metadata/.log:!MESSAGE File does not exist: tools/eclipse/4.4/plugins/org.objectweb.asm.source_3.3.1.v201105211655.jar

它成了一個很長的線程，我很抱歉。 怎么解決？

Answer 1

根據您的評論，您聲明您正在使用Indigo。 直到Luna才引入Java 8支持，盡管Kepler可以通過補丁來支持它。 https://www.eclipse.org/lists/eclipse.org-committers/msg00948.html

雖然這里有一個博客，有人將其與Juno合作： https ： //tuhrig.de/java-8-in-eclipse-juno/

這是一個堆棧溢出的答案，說他們無法讓它與Indigo一起工作。 https://stackoverflow.com/a/40053177/3501286