Error about sun/misc/BASE64Encoder on Eclipse

问题

when i run my app in mac, and show up this message Errors occurred during the build. Errors running builder 'Android Package Builder' on project 'IMPEXP'. sun/misc/BASE64Encoder

but this project is work fine in windows 10 computer, and i don't use any about base64Encoder

eclipse Version: Photon Milestone 3 (4.8.0M3) JRE java se 9.0

edit!

i found something like below

!ENTRY org.eclipse.core.resources 4 2 2017-11-09 11:50:09.047
!MESSAGE Problems occurred when invoking code from plug-in: "org.eclipse.core.resources".
!STACK 0
java.lang.NoClassDefFoundError: sun/misc/BASE64Encoder
    at com.android.sdklib.internal.build.SignedJarBuilder.<init>(SignedJarBuilder.java:177)
    at com.android.sdklib.build.ApkBuilder.init(ApkBuilder.java:446)
    at com.android.sdklib.build.ApkBuilder.<init>(ApkBuilder.java:422)
    at com.android.sdklib.build.ApkBuilder.<init>(ApkBuilder.java:362)
    at com.android.ide.eclipse.adt.internal.build.BuildHelper.finalPackage(BuildHelper.java:391)
    at com.android.ide.eclipse.adt.internal.build.BuildHelper.finalDebugPackage(BuildHelper.java:359)
    at com.android.ide.eclipse.adt.internal.build.builders.PostCompilerBuilder.build(PostCompilerBuilder.java:632)
    at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:735)
    at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
    at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:206)
    at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:330)
    at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:405)
    at org.eclipse.core.internal.resources.Project$1.run(Project.java:566)
    at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2240)
    at org.eclipse.core.internal.resources.Project.internalBuild(Project.java:544)
    at org.eclipse.core.internal.resources.Project.build(Project.java:120)
    at com.android.ide.eclipse.adt.internal.project.ProjectHelper.doFullIncrementalDebugBuild(ProjectHelper.java:1143)
    at com.android.ide.eclipse.adt.internal.launch.LaunchConfigDelegate.launch(LaunchConfigDelegate.java:155)
    at org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:885)
    at org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:739)
    at org.eclipse.debug.internal.ui.DebugUIPlugin.buildAndLaunch(DebugUIPlugin.java:1039)
    at org.eclipse.debug.internal.ui.DebugUIPlugin$8.run(DebugUIPlugin.java:1256)
    at org.eclipse.core.internal.jobs.Worker.run(Worker.java:56)
Caused by: java.lang.ClassNotFoundException: sun.misc.BASE64Encoder cannot be found by com.android.ide.eclipse.base_23.0.7.2120684
    at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:484)
    at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:395)
    at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:387)
    at org.eclipse.osgi.internal.loader.ModuleClassLoader.loadClass(ModuleClassLoader.java:150)
    at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:496)
    ... 23 more

回答1:

As others have pointed out already, this is a compatibility issue—you need exactly Java 8 to run Eclipse.

• Install JDK 8 if you don’t have it already.
• In Eclipse, go to Window > Preferences > Installed JREs. Make sure Java 8 appears in the list and is selected. After that, close Eclipse.
• Additionally, eclipse.ini also has a reference to the Java VM it uses. Make sure the VM it points to is Java 8 (see link on how to find it and how to set VM preferences).
• Restart Eclipse and try again.

回答2:

The Android code you are using is trying to use the sun.misc.BASE64Encoder class.

This deprecated class has been removed from Java 9 so this is not going to work.

You will need to switch back to Java 8 or find an update to the Android code (if there is one).

回答3:

I'm working with Windows 7. I had to change the preferences and the ini file. Both had C:\Program Files\Java\jdk-12.0.1\bin which I changed to C:\Program Files\Java\jre1.8.0_221\bin. It now works!

来源：https://stackoverflow.com/questions/47216694/error-about-sun-misc-base64encoder-on-eclipse