"Om de commandoregeltool 'java' te gebruiken, moet u een JDK installeren.".

Ik heb uiteraard al meerdere keren de laatste versie geïnstalleerd waar die "Meer info" naartoe verwijst: http://www.java.com/en/download/mac_download.jsp , maar hij blijft terugkeren

en eigenlijk verbaast het me dat ik de vraag uberhaupt krijg, wel programma geeft deze commandoregeltool?

ik ben echt een leek op dit gebied, M'n mac is overigens behoorlijk traag, ook hoor ik graag wat ik daartegen kan doen... of wellicht heeft het met elkaar te maken

Macbook pro 13"  2011
o.s. X el capitain(maar daarvoor deed ie het ook al)

(Bewerkt door Gatso037 om 22:00, 24-03-2016)

Gatso037 om 21:58, 24-03-2016
M'n mac is overigens behoorlijk traag, ook hoor ik graag wat ik daartegen kan doen...

Je zou eens een EtreCheck overzicht hier kunnen plaatsen.
https://etrecheck.com

EtreCheck version: 2.9.10 (261)
Report generated 2016-03-24 22:25:39
Download EtreCheck from https://etrecheck.com
Runtime 2:27
Performance: Excellent

Click the [Support] links for help with non-Apple products.
Click the [Details] links for more information about that line.
Click the [Remove] links to remove adware.
Click the [Check files] link for help with unknown files.

Problem: Computer is too slow

Hardware Information: ⓘ
   MacBook Pro (13-inch, Late 2011)
   [Technical Specifications] - [User Guide] - [Warranty & Service]
   MacBook Pro - model: MacBookPro8,1
   1 2,4 GHz Intel Core i5 CPU: 2-core
   8 GB RAM Upgradeable - [Instructions]
       BANK 0/DIMM0
           Empty  
       BANK 1/DIMM0
           8 GB DDR3 1600 MHz ok
   Bluetooth: Old - Handoff/Airdrop2 not supported
   Wireless:  en1: 802.11 a/b/g/n
   Battery: Health = Normal - Cycle count = 589

Video Information: ⓘ
   Intel HD Graphics 3000
       Color LCD 1280 x 800

System Software: ⓘ
   OS X El Capitan 10.11.2 (15C50) - Time since boot: less than an hour

Disk Information: ⓘ
   TOSHIBA MK5065GSXF disk0 : (500,11 GB) (Rotational)
       EFI (disk0s1) <not mounted> : 210 MB
       Recovery HD (disk0s3) <not mounted>  [Recovery]: 650 MB
       Macintosh HD (disk1) / : 498.88 GB (167.68 GB free)
           Core Storage: disk0s2 499.25 GB Online

   MATSHITADVD-R   UJ-8A8   ()

USB Information: &#9432;
   Apple Inc. FaceTime HD Camera (Built-in)
   Apple Inc. Apple Internal Keyboard / Trackpad
   Apple Inc. BRCM2070 Hub
       Apple Inc. Bluetooth USB Host Controller
   Apple Computer, Inc. IR Receiver

Thunderbolt Information: &#9432;
   Apple Inc. thunderbolt_bus

Gatekeeper: &#9432;
   Mac App Store and identified developers

Adware: &#9432;
   ~/Library/LaunchAgents/com.extensions.updater69337.agent.plist
   ~/Library/LaunchAgents/com.spigot.ApplicationManager.plist
   2 adware files found. [Remove]

Unknown Files: &#9432;
   ~/Library/LaunchAgents/UpdateDownloader
   ~/Library/LaunchAgents/com.extensions.updater69337.ver
   2 unknown files found. [Check files]

Kernel Extensions: &#9432;
       /Applications/Toast 11 Titanium/Spin Doctor.app
   [not loaded]    com.hzsystems.terminus.driver (4 - 2014-01-05) [Support]

       /System/Library/Extensions
   [not loaded]    com.ScreamingBee.driver.SBVirtualMic (1.0.4 - SDK 10.8 - 2016-03-22) [Support]
   [not loaded]    com.roxio.BluRaySupport (1.1.6 - 2016-03-22) [Support]

       ~/Library/Services/ToastIt.service/Contents/MacOS
   [not loaded]    com.roxio.TDIXController (2.0 - 2014-01-05) [Support]

System Launch Agents: &#9432;
   [not loaded]    7 Apple tasks
   [loaded]    159 Apple tasks
   [running]    70 Apple tasks

System Launch Daemons: &#9432;
   [not loaded]    46 Apple tasks
   [loaded]    159 Apple tasks
   [running]    83 Apple tasks

Launch Agents: &#9432;
   [loaded]    com.oracle.java.Java-Updater.plist (2014-12-13) [Support]

Launch Daemons: &#9432;
   [loaded]    com.adobe.fpsaud.plist (2016-03-19) [Support]
   [loaded]    com.microsoft.office.licensing.helper.plist (2010-09-28) [Support]
   [loaded]    com.oracle.java.Helper-Tool.plist (2014-12-13) [Support]

User Launch Agents: &#9432;
   [not loaded]    UpdateDownloader (2015-03-05) [Support]
   [failed]    com.apple.CSConfigDotMacCert-[...]@me.com-SharedServices.Agent.plist
   [loaded]    com.bittorrent.uTorrent.plist (2016-01-05) [Support]
   [loaded]    com.extensions.updater69337.agent.plist (2015-03-09) Adware!  [Remove]
       ~/Library/LaunchAgents/UpdateDownloader
   [not loaded]    com.extensions.updater69337.ver (2015-03-09) [Support]
   [failed]    com.facebook.videochat.[redacted].plist (2014-08-10) [Support]
   [loaded]    com.google.keystone.agent.plist (2016-03-03) [Support]
   [failed]    com.jdibackup.ZipCloud.autostart.plist (2016-01-05) [Support]
   [failed]    com.jdibackup.ZipCloud.notify.plist (2016-01-05) [Support]
   [running]    com.spigot.ApplicationManager.plist (2016-01-05) Adware!  [Remove]
       ~/Library/Application Support/Spigot/ApplicationManager

User Login Items: &#9432;
   Moveslink2    Programma  (/Applications/Moveslink2.app)
   iTunesHelper    Programma  (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)

Other Apps: &#9432;
   [running]    Suunto.Moveslink2.86432
   [loaded]    402 Apple tasks
   [running]    174 Apple tasks

Internet Plug-ins: &#9432;
   FlashPlayer-10.6: 21.0.0.197 - SDK 10.6 (2016-03-23) [Support]
   QuickTime Plugin: 7.7.3 (2015-12-03)
   NP_2020Player_IKEA: 5.0.94.1 - SDK 10.6 (2012-09-28) [Support]
   Flash Player: 21.0.0.197 - SDK 10.6 (2016-03-23) [Support]
   NP_2020Player_WEB: 5.0.94.0 - SDK 10.6 (2011-10-26) [Support]
   Default Browser: 601 - SDK 10.11 (2015-12-03)
   SharePointBrowserPlugin: 14.2.3 - SDK 10.6 (2012-10-18) [Support]
   Silverlight: 5.1.41212.0 - SDK 10.6 (2016-01-21) [Support]
   JavaAppletPlugin: Java 8 Update 73 build 02 (2016-03-22) Check version

3rd Party Preference Panes: &#9432;
   Flash Player (2016-03-19) [Support]
   Growl (2012-05-09) [Support]
   Java (2016-03-22) [Support]

Time Machine: &#9432;
   Time Machine not configured!

Top Processes by CPU: &#9432;
       74%    mdworker(11)
       10%    mds
        6%    WindowServer
        5%    Activity Monitor
        4%    Moveslink2

Top Processes by Memory: &#9432;
   622 MB    kernel_task
   532 MB    iMovie
   516 MB    firefox
   180 MB    mdworker(11)
   98 MB    photolibraryd

Virtual Memory Information: &#9432;
   818 MB    Free RAM
   7.20 GB    Used RAM (4.23 GB Cached)
   0 B    Swap Used

Diagnostics Information: &#9432;
   Mar 24, 2016, 09:37:09 PM    Self test - passed
   Mar 22, 2016, 03:36:58 PM    /Library/Logs/DiagnosticReports/plugin-container_2016-03-22-153658_[redacted].crash
       /Applications/Firefox.app/Contents/MacOS/plugin-container.app/Contents/MacOS/plugin-container

EtreCheck version: 2.9.10 (261)
Report generated 2016-03-24 23:36:16
Download EtreCheck from https://etrecheck.com
Runtime 2:36
Performance: Excellent

Click the [Support] links for help with non-Apple products.
Click the [Details] links for more information about that line.

Problem: Computer is too slow

Hardware Information: &#9432;
   MacBook Pro (13-inch, Late 2011)
   [Technical Specifications] - [User Guide] - [Warranty & Service]
   MacBook Pro - model: MacBookPro8,1
   1 2,4 GHz Intel Core i5 CPU: 2-core
   8 GB RAM Upgradeable - [Instructions]
       BANK 0/DIMM0
           Empty  
       BANK 1/DIMM0
           8 GB DDR3 1600 MHz ok
   Bluetooth: Old - Handoff/Airdrop2 not supported
   Wireless:  en1: 802.11 a/b/g/n
   Battery: Health = Normal - Cycle count = 589

Video Information: &#9432;
   Intel HD Graphics 3000
       Color LCD 1280 x 800

System Software: &#9432;
   OS X El Capitan 10.11.2 (15C50) - Time since boot: less than an hour

Disk Information: &#9432;
   TOSHIBA MK5065GSXF disk0 : (500,11 GB) (Rotational)
       EFI (disk0s1) <not mounted> : 210 MB
       Recovery HD (disk0s3) <not mounted>  [Recovery]: 650 MB
       Macintosh HD (disk1) / : 498.88 GB (168.84 GB free)
           Core Storage: disk0s2 499.25 GB Online

   MATSHITADVD-R   UJ-8A8   ()

USB Information: &#9432;
   Apple Computer, Inc. IR Receiver
   Apple Inc. FaceTime HD Camera (Built-in)
   Apple Inc. Apple Internal Keyboard / Trackpad
   Apple Inc. BRCM2070 Hub
       Apple Inc. Bluetooth USB Host Controller

Thunderbolt Information: &#9432;
   Apple Inc. thunderbolt_bus

Gatekeeper: &#9432;
   Mac App Store and identified developers

Kernel Extensions: &#9432;
       /Applications/Toast 11 Titanium/Spin Doctor.app
   [not loaded]    com.hzsystems.terminus.driver (4 - 2014-01-05) [Support]

       /System/Library/Extensions
   [not loaded]    com.ScreamingBee.driver.SBVirtualMic (1.0.4 - SDK 10.8 - 2016-03-22) [Support]
   [not loaded]    com.roxio.BluRaySupport (1.1.6 - 2016-03-22) [Support]

       ~/Library/Services/ToastIt.service/Contents/MacOS
   [not loaded]    com.roxio.TDIXController (2.0 - 2014-01-05) [Support]

System Launch Agents: &#9432;
   [not loaded]    7 Apple tasks
   [loaded]    160 Apple tasks
   [running]    69 Apple tasks

System Launch Daemons: &#9432;
   [not loaded]    46 Apple tasks
   [loaded]    158 Apple tasks
   [running]    84 Apple tasks

Launch Agents: &#9432;
   [loaded]    com.oracle.java.Java-Updater.plist (2014-12-13) [Support]

Launch Daemons: &#9432;
   [loaded]    com.adobe.fpsaud.plist (2016-03-19) [Support]
   [loaded]    com.malwarebytes.MBAMHelperTool.plist (2016-03-24) [Support]
   [loaded]    com.microsoft.office.licensing.helper.plist (2010-09-28) [Support]
   [loaded]    com.oracle.java.Helper-Tool.plist (2014-12-13) [Support]

User Launch Agents: &#9432;
   [failed]    com.apple.CSConfigDotMacCert-[...]@me.com-SharedServices.Agent.plist
   [loaded]    com.bittorrent.uTorrent.plist (2016-01-05) [Support]
   [failed]    com.facebook.videochat.[redacted].plist (2014-08-10) [Support]
   [loaded]    com.google.keystone.agent.plist (2016-03-03) [Support]

User Login Items: &#9432;
   Moveslink2    Programma  (/Applications/Moveslink2.app)
   iTunesHelper    Programma  (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)

Other Apps: &#9432;
   [running]    Suunto.Moveslink2.86432
   [running]    com.etresoft.EtreCheck.105312
   [loaded]    400 Apple tasks
   [running]    167 Apple tasks

Internet Plug-ins: &#9432;
   FlashPlayer-10.6: 21.0.0.197 - SDK 10.6 (2016-03-23) [Support]
   QuickTime Plugin: 7.7.3 (2015-12-03)
   NP_2020Player_IKEA: 5.0.94.1 - SDK 10.6 (2012-09-28) [Support]
   Flash Player: 21.0.0.197 - SDK 10.6 (2016-03-23) [Support]
   NP_2020Player_WEB: 5.0.94.0 - SDK 10.6 (2011-10-26) [Support]
   Default Browser: 601 - SDK 10.11 (2015-12-03)
   SharePointBrowserPlugin: 14.2.3 - SDK 10.6 (2012-10-18) [Support]
   Silverlight: 5.1.41212.0 - SDK 10.6 (2016-01-21) [Support]
   JavaAppletPlugin: Java 8 Update 73 build 02 (2016-03-22) Check version

3rd Party Preference Panes: &#9432;
   Flash Player (2016-03-19) [Support]
   Growl (2012-05-09) [Support]
   Java (2016-03-22) [Support]

Time Machine: &#9432;
   Time Machine not configured!

Top Processes by CPU: &#9432;
       68%    mds
       38%    mdworker(12)
        3%    Moveslink2
        3%    WindowServer
        1%    kernel_task

Top Processes by Memory: &#9432;
   591 MB    kernel_task
   197 MB    mds_stores
   180 MB    mdworker(12)
   156 MB    ocspd
   66 MB    sharingd

Virtual Memory Information: &#9432;
   4.39 GB    Free RAM
   3.61 GB    Used RAM (1.67 GB Cached)
   0 B    Swap Used

Diagnostics Information: &#9432;
   Mar 24, 2016, 11:27:19 PM    Self test - passed
   Mar 22, 2016, 03:36:58 PM    /Library/Logs/DiagnosticReports/plugin-container_2016-03-22-153658_[redacted].crash
       /Applications/Firefox.app/Contents/MacOS/plugin-container.app/Contents/MacOS/plugin-container

[loaded] com.oracle.java.Helper-Tool.plist (2014-12-13) [Support]

Heb je Java niet nodig, gooi die property list dan weg. Of gooi hem in elk geval weg, een .plist herbouwt zichzelf toch bij (her)start.

Wat je Etrecheck en traagheid van je iMac betreft merk ik vooral op dat wellicht je Time Machine of Spotlight indexering nog een waanzinnig groot deel van je processorkracht opvreet:

Top Processes by CPU: &#9432;
68% mds
38% mdworker(12)

Dat gaat dus al over meer dan 100% van een processor kernel. Als die Process IDs niet gaan multithreaden ( i.e. verdelen over meerdere processor kernels), ligt je Macje op zijn gat, pardon my French.

Wat de crashes betreft: ik vermoed dat je iMac/FireFox/ OSX crashed op een niet gevonden Java plugin, JDK of JRE.
Vergeet ook niet dat sommige plugins of apps een verouderde JRE/JDK versie vergen!

Dat zijn mijn voornaamste bevindingen. Er zit wellicht nog wat verdachts in het Etrecheck, maar dat vergt meer studie en is in dit geval bijzaak m.i.

Succes!

(Bewerkt door HEXDIY om 3:16, 25-03-2016)

Ik zou die app sowieso uit de Login Items halen, en pas opstarten als je echt even iets met je horloge wilt doen.

Ik kan de "com.oracle.java.Helper-Tool.plist" nergens vinden? sorry.

++++volgende voortkomende vraag+++++++++++++++

Ik zie nog een hoop andere meuk:
Launch Daemons: &#9432;
[loaded] com.adobe.fpsaud.plist (2016-03-19) [Support]
[loaded] com.malwarebytes.MBAMHelperTool.plist (2016-03-24) [Support]
[loaded] com.microsoft.office.licensing.helper.plist (2010-09-28) [Support]
[loaded] com.oracle.java.Helper-Tool.plist (2014-12-13) [Support]

User Launch Agents: &#9432;
[failed] com.apple.CSConfigDotMacCert-[...]@me.com-SharedServices.Agent.plist
[loaded] com.bittorrent.uTorrent.plist (2016-01-05) [Support]
[failed] com.facebook.videochat.[redacted].plist (2014-08-10) [Support]
[loaded] com.google.keystone.agent.plist (2016-03-03) [Support]

Houd dit in dat deze programmas((utorrent facebookvideo googlekeystone malwarebytes iets van adobe?))allemaal ongewenst geladen worden elke keer? ik weet van de meesten niet eens wat het is...

kan ik dat stoppen zonder het programma te hoeven verwijderen?

Wat je Etrecheck en traagheid van je iMac betreft merk ik vooral op dat wellicht je Time Machine of Spotlight indexering nog een waanzinnig groot deel van je processorkracht opvreet:

Top Processes by CPU: &#9432;
68% mds
38% mdworker(12)

Dat gaat dus al over meer dan 100% van een processor kernel. Als die Process IDs niet gaan multithreaden ( i.e. verdelen over meerdere processor kernels), ligt je Macje op zijn gat, pardon my French.

Time Machine staat uit en  Spotlight indexering kan ik niets aan veranderen lijkt me... wat kan dit probleem dan veroorzaken? want het lijkt me de oorzaak van de trage prestaties

dit is de huidige etrecheck
EtreCheck version: 2.9.10 (261)
Report generated 2016-03-25 15:41:51
Download EtreCheck from https://etrecheck.com
Runtime 2:48
Performance: Excellent

Failed to read adware signatures!

Problem: Computer is too slow

Hardware Information: &#9432;
   MacBook Pro (13-inch, Late 2011)
   [Technical Specifications] - [User Guide] - [Warranty & Service]
   MacBook Pro - model: MacBookPro8,1
   1 2,4 GHz Intel Core i5 CPU: 2-core
   8 GB RAM Upgradeable - [Instructions]
       BANK 0/DIMM0
           Empty  
       BANK 1/DIMM0
           8 GB DDR3 1600 MHz ok
   Bluetooth: Old - Handoff/Airdrop2 not supported
   Wireless:  en1: 802.11 a/b/g/n
   Battery: Health = Normal - Cycle count = 590

Video Information: &#9432;
   Intel HD Graphics 3000
       Color LCD 1280 x 800

System Software: &#9432;
   OS X El Capitan 10.11.2 (15C50) - Time since boot: less than an hour

Disk Information: &#9432;
   TOSHIBA MK5065GSXF disk0 : (500,11 GB) (Rotational)
       EFI (disk0s1) <not mounted> : 210 MB
       Recovery HD (disk0s3) <not mounted>  [Recovery]: 650 MB
       Macintosh HD (disk1) / : 498.88 GB (168.81 GB free)
           Core Storage: disk0s2 499.25 GB Online

   MATSHITADVD-R   UJ-8A8   ()

USB Information: &#9432;
   Apple Inc. FaceTime HD Camera (Built-in)
   Apple Inc. Apple Internal Keyboard / Trackpad
   Apple Inc. BRCM2070 Hub
       Apple Inc. Bluetooth USB Host Controller
   Apple Computer, Inc. IR Receiver

Thunderbolt Information: &#9432;
   Apple Inc. thunderbolt_bus

Gatekeeper: &#9432;
   Mac App Store and identified developers

Kernel Extensions: &#9432;
       /Applications/Toast 11 Titanium/Spin Doctor.app
   [not loaded]    com.hzsystems.terminus.driver (4 - 2014-01-05) [Support]

       /System/Library/Extensions
   [not loaded]    com.ScreamingBee.driver.SBVirtualMic (1.0.4 - SDK 10.8 - 2016-03-22) [Support]
   [not loaded]    com.roxio.BluRaySupport (1.1.6 - 2016-03-22) [Support]

       ~/Library/Services/ToastIt.service/Contents/MacOS
   [not loaded]    com.roxio.TDIXController (2.0 - 2014-01-05) [Support]

System Launch Agents: &#9432;
   [not loaded]    7 Apple tasks
   [loaded]    161 Apple tasks
   [running]    68 Apple tasks

System Launch Daemons: &#9432;
   [not loaded]    46 Apple tasks
   [loaded]    161 Apple tasks
   [running]    81 Apple tasks

User Launch Agents: &#9432;
   [failed]    com.apple.CSConfigDotMacCert-[...]@me.com-SharedServices.Agent.plist
   [loaded]    com.bittorrent.uTorrent.plist (2016-01-05) [Support]
   [failed]    com.facebook.videochat.[redacted].plist (2014-08-10) [Support]
   [loaded]    com.google.keystone.agent.plist (2016-03-03) [Support]

User Login Items: &#9432;
   None

Other Apps: &#9432;
   [running]    com.etresoft.EtreCheck.105312
   [loaded]    399 Apple tasks
   [running]    164 Apple tasks

Internet Plug-ins: &#9432;
   FlashPlayer-10.6: 21.0.0.197 - SDK 10.6 (2016-03-23) [Support]
   QuickTime Plugin: 7.7.3 (2015-12-03)
   NP_2020Player_IKEA: 5.0.94.1 - SDK 10.6 (2012-09-28) [Support]
   Flash Player: 21.0.0.197 - SDK 10.6 (2016-03-23) [Support]
   NP_2020Player_WEB: 5.0.94.0 - SDK 10.6 (2011-10-26) [Support]
   Default Browser: 601 - SDK 10.11 (2015-12-03)
   SharePointBrowserPlugin: 14.2.3 - SDK 10.6 (2012-10-18) [Support]
   Silverlight: 5.1.41212.0 - SDK 10.6 (2016-01-21) [Support]
   JavaAppletPlugin: Unknown (2016-03-22) Check version

3rd Party Preference Panes: &#9432;
   Flash Player (2016-03-19) [Support]
   Growl (2012-05-09) [Support]
   Java (2016-03-22) [Support]

Time Machine: &#9432;
   Time Machine not configured!

Top Processes by CPU: &#9432;
       38%    firefox
        2%    kernel_task
        1%    fontd
        0%    WindowServer
        0%    askpermissiond

Top Processes by Memory: &#9432;
   533 MB    kernel_task
   352 MB    firefox
   221 MB    mds_stores
   188 MB    Finder
   156 MB    ocspd

Virtual Memory Information: &#9432;
   4.14 GB    Free RAM
   3.86 GB    Used RAM (1.66 GB Cached)
   0 B    Swap Used

Diagnostics Information: &#9432;
   Mar 25, 2016, 03:35:41 PM    Self test - passed
   Mar 24, 2016, 11:42:48 PM    /Library/Logs/DiagnosticReports/firefox_2016-03-24-234248_[redacted].cpu_resource.diag [Details]
       /Applications/Firefox.app/Contents/MacOS/firefox

Zie de Etrecheck:

JavaAppletPlugin: Unknown (2016-03-22) Check version

Java (2016-03-22) [Support]

Verder zie ik nog heel wat problematische meuk staan. Misschien studeer ik daar later nog eens op.
Geen adware, maar wellicht gemigreerde rommel. O.a.:

[not loaded] com.hzsystems.terminus.driver (4 - 2014-01-05) [Support]
[not loaded] com.ScreamingBee.driver.SBVirtualMic (1.0.4 - SDK 10.8 - 2016-03-22) [Support]
[failed] com.apple.CSConfigDotMacCert-[...]@me.com-SharedServices.Agent.plist