当打开eclipse marketplace的时候时候，发现有如下错误:
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Message:
Cannot install remote marketplace locations: Connection failed
This is most often caused by a problem with your internet connection. Please check your internet connection and retry.
Exception Stack Trace:
org.eclipse.core.runtime.CoreException: Unable to read repository at http://marketplace.eclipse.org/catalogs/api/p.
at org.eclipse.equinox.internal.p2.transport.ecf.RepositoryTransport.stream(RepositoryTransport.java:181)
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.epp.internal.mpc.core.util.AbstractP2TransportFactory.invokeStream(AbstractP2TransportFactory.java:35)
at org.eclipse.epp.internal.mpc.core.util.TransportFactory$1.stream(TransportFactory.java:69)
at org.eclipse.epp.internal.mpc.core.service.RemoteMarketplaceService.processRequest(RemoteMarketplaceService.java:131)
at org.eclipse.epp.internal.mpc.core.service.RemoteMarketplaceService.processRequest(RemoteMarketplaceService.java:85)
at org.eclipse.epp.internal.mpc.core.service.RemoteMarketplaceService.processRequest(RemoteMarketplaceService.java:72)
at org.eclipse.epp.internal.mpc.core.service.DefaultCatalogService.listCatalogs(DefaultCatalogService.java:36)
at org.eclipse.epp.internal.mpc.ui.commands.MarketplaceWizardCommand$5.run(MarketplaceWizardCommand.java:254)
at org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:121)
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解决方案是修改eclipse.ini，然后重启eclipse
-vmargs -Xmx512m ... -Djava.net.preferIPv4Stack=true
本文转自：https://blog.csdn.net/faq_tong/article/details/41313381