意外的 Null 指针导致 rcp 主题看起来很奇怪

Question

主题突然出现空指针异常，这是堆栈跟踪有没有人看到这样的问题并解决了它。我假设正在发生某种竞争状况，但我无法查明原因。

java.lang.NullPointerException
at org.eclipse.ui.internal.themes.ColorAndFontProviderImpl.getCurrentTheme(ColorAndFontProviderImpl.java:51)
at org.eclipse.ui.internal.themes.ColorAndFontProviderImpl.getFont(ColorAndFontProviderImpl.java:35)
at org.eclipse.e4.ui.css.swt.helpers.CSSSWTFontHelper.findFontDataByDefinition(CSSSWTFontHelper.java:218)
at org.eclipse.e4.ui.css.swt.helpers.CSSSWTFontHelper.getFontData(CSSSWTFontHelper.java:163)
at org.eclipse.e4.ui.css.swt.properties.converters.CSSValueSWTFontDataConverterImpl.convert(CSSValueSWTFontDataConverterImpl.java:73)
at org.eclipse.e4.ui.css.swt.properties.converters.CSSValueSWTFontConverterImpl.convert(CSSValueSWTFontConverterImpl.java:34)
at org.eclipse.e4.ui.css.core.impl.engine.AbstractCSSEngine.convert(AbstractCSSEngine.java:1077)
at org.eclipse.e4.ui.css.swt.properties.css2.CSSPropertyFontSWTHandler.onAllCSSPropertiesApplyed(CSSPropertyFontSWTHandler.java:251)
at org.eclipse.e4.ui.css.core.impl.engine.AbstractCSSEngine.applyStyleDeclaration(AbstractCSSEngine.java:549)
at org.eclipse.e4.ui.css.core.impl.engine.AbstractCSSEngine.applyStyles(AbstractCSSEngine.java:413)
at org.eclipse.e4.ui.css.core.impl.engine.AbstractCSSEngine.applyStyles(AbstractCSSEngine.java:354)
at org.eclipse.e4.ui.css.swt.internal.theme.ThemeEngine.applyStyles(ThemeEngine.java:514)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$11.setClassnameAndId(PartRenderingEngine.java:1321)
at org.eclipse.e4.ui.workbench.renderers.swt.SWTPartRenderer.setCSSInfo(SWTPartRenderer.java:110)
at org.eclipse.e4.ui.workbench.renderers.swt.SWTPartRenderer.styleElement(SWTPartRenderer.java:80)
at org.eclipse.e4.ui.workbench.renderers.swt.StackRenderer$5.handleEvent(StackRenderer.java:524)
at org.eclipse.e4.ui.services.internal.events.UIEventHandler$1.run(UIEventHandler.java:40)
at org.eclipse.swt.widgets.Synchronizer.syncExec(Synchronizer.java:187)
at org.eclipse.swt.widgets.Display.syncExec(Display.java:4734)
at org.eclipse.e4.ui.internal.workbench.swt.E4Application$1.syncExec(E4Application.java:218)
at org.eclipse.e4.ui.services.internal.events.UIEventHandler.handleEvent(UIEventHandler.java:36)
at org.eclipse.equinox.internal.event.EventHandlerWrapper.handleEvent(EventHandlerWrapper.java:197)
at org.eclipse.equinox.internal.event.EventHandlerTracker.dispatchEvent(EventHandlerTracker.java:197)
at org.eclipse.equinox.internal.event.EventHandlerTracker.dispatchEvent(EventHandlerTracker.java:1)
at org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:230)
at org.eclipse.osgi.framework.eventmgr.ListenerQueue.dispatchEventSynchronous(ListenerQueue.java:148)
at org.eclipse.equinox.internal.event.EventAdminImpl.dispatchEvent(EventAdminImpl.java:135)
at org.eclipse.equinox.internal.event.EventAdminImpl.sendEvent(EventAdminImpl.java:78)
at org.eclipse.equinox.internal.event.EventComponent.sendEvent(EventComponent.java:39)
at org.eclipse.e4.ui.services.internal.events.EventBroker.send(EventBroker.java:81)
at org.eclipse.e4.ui.workbench.UIEvents.publishEvent(UIEvents.java:372)
at org.eclipse.e4.ui.workbench.UIEvents.publishEvent(UIEvents.java:341)
at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.activate(PartServiceImpl.java:652)
at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.activate(PartServiceImpl.java:615)
at org.eclipse.e4.ui.internal.workbench.swt.AbstractPartRenderer.activate(AbstractPartRenderer.java:106)
at org.eclipse.e4.ui.workbench.renderers.swt.ContributedPartRenderer$1.handleEvent(ContributedPartRenderer.java:61)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4353)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1061)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1085)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1070)
at org.eclipse.swt.widgets.Shell.setActiveControl(Shell.java:1453)
at org.eclipse.swt.widgets.Shell.setActiveControl(Shell.java:1416)
at org.eclipse.swt.widgets.Control.sendFocusEvent(Control.java:2855)
at org.eclipse.swt.widgets.Widget.wmSetFocus(Widget.java:2425)
at org.eclipse.swt.widgets.Control.WM_SETFOCUS(Control.java:5236)
at org.eclipse.swt.widgets.Control.windowProc(Control.java:4680)
at org.eclipse.swt.widgets.Display.windowProc(Display.java:5023)
at org.eclipse.swt.internal.win32.OS.SetFocus(Native Method)
at org.eclipse.swt.widgets.Control.forceFocus(Control.java:1097)
at org.eclipse.swt.widgets.Control.setSavedFocus(Control.java:3619)
at org.eclipse.swt.widgets.Decorations.restoreFocus(Decorations.java:837)
at org.eclipse.swt.widgets.Shell.open(Shell.java:1248)
at org.eclipse.e4.ui.workbench.renderers.swt.WBWRenderer.postProcess(WBWRenderer.java:745)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:678)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:766)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.access$2(PartRenderingEngine.java:737)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$7.run(PartRenderingEngine.java:731)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.createGui(PartRenderingEngine.java:715)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$9.run(PartRenderingEngine.java:1074)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1032)
at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:148)
at org.eclipse.e4.ui.internal.workbench.swt.E4Application.start(E4Application.java:164)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:134)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:380)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:235)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:648)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:603)
at org.eclipse.equinox.launcher.Main.run(Main.java:1465)
at org.eclipse.equinox.launcher.Main.main(Main.java:1438)

Answer 1

在运行时配置中添加 -clean 标志可以解决问题，但仍然不知道是什么原因造成的。所以我会很感激一个临时修复的解决方案

Answer 2

将其添加到 Run/Run-Configuration/Arguments -os ${target.os} -ws ${target.ws} -arch ${target.arch} -nl ${target.nl} -consoleLog -clean

Answer 3

首先，这是 Eclipse Bug 440763 中的一个已知错误。它与 Eclipse 版本有关，因为在 4.3 中我没有遇到异常。它看起来像是 Eclipse 4.4 中 CSS 引擎的回归问题。

我不知道到底是什么问题，但这是我摆脱它的方法。

1. 从依赖项（和目标平台）中删除这个插件 org.eclipse.ui.themes 解决了这个问题。
2. 转到运行配置 -> 参数 -> 程序参数
3. 添加 -clearPersistedState

我想，这不符合作为回应的条件，因为我没有给出任何解释，但它确实有帮助。

Answer 4

1. 转到C:\Users\USER\eclipse\ECLIPSE_VERSION\eclipse\configuration\config.ini

2. 打开文件config.ini

3. 添加这一行：osgi.clean=true

4. 开始日食。

5. 如果它正在工作，然后删除此行。

这与-clean 参数相同。

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