If you see this error while starting the WebLogic Adminserver

java.lang.NoClassDefFoundError: oracle/dfw/impl/common/TempFileManager

        at oracle.dfw.spi.portable.PortableDiagnosticsFrameworkProvider.init(PortableDiagnosticsFrameworkProvider.java:120)

        at oracle.dfw.framework.DiagnosticsFramework.initializeProvider(DiagnosticsFramework.java:98)

        at oracle.dfw.framework.DiagnosticsFramework.(DiagnosticsFramework.java:53)

        at oracle.dms.wls.DMSStartup.start(DMSStartup.java:212)

        at oracle.dms.wls.DMSStartup.startUp(DMSStartup.java:118)

        Truncated. see log file for complete stacktrace

Try the following fix

Clear the /tmp space