How to Add Undo/Redo Toolbar Buttons to Eclipse | MCU on Eclipse
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I've found a reproducible scenario that occurs when undo is "rolled back" all the way to the original state. The next undo will cause an incorrect reset of the undo command's fText field.
It happens while the redo stack is being cleared. Still chasing down exactly how this occurs. It may or may not be this bug.
– [Undo] Undo becomes disabled
Frederic - do you think that this might have been the sequence? That you deleted your text after having done a bunch of undos? If not, then I'm chasing an unrelated bug. I'm also working on tracing support inside the undo framework so that you'll be able to provide more information to help track this down.
Comment 13 Susan McCourt There are now tracing options you can set for the operations framework. Using these may help me diagnose the sequence that leads to disabled undo.
Verbose mode will cause tons of tracing, but is the best way to give me a clue as to what is happening org. I finally decided to start using it with Sun VM this morning. I let you asap hopefully today if I encounter it again or not. Comment 15 John Arthorne Undo no longer works in one of my Java editors no matter what I do. It works in other editors that are open.
Redo keyboard shortcut for Eclipse - Stack Overflow
I had made quite a few changes in that file, and I'm sure I was using undo at various times. My undo history size is set to 40, if that's useful. Of course, after closing and reopening the editor, I can no longer reproduce. Join For Free Sensu is an open source monitoring event pipeline. No two words encompass the troubles, headaches and quirks most developers face when attempting to link applications to relational databases RDBMS.
But lets face it, object orientated designs aren't going away anytime soon from mainstream languages and neither are the relational storage systems used in most applications. One side works with objects, while the other with tables. ORM's gain in popularity is due precisely to it being specifically designed to address the interaction between object and tables.
In the case of JPA, there is a standard body charged with setting its course, a process which has given way to several JPA implementations, among the three most popular you will find: But even though all three are based on the same standard, ORM being such a deep and complex topic, beyond core functionality each implementation has differences ranging from configuration to optimization techniques.
What I will do next is explain a series of topics related to optimizing an application's use of the JPA, using and comparing each of the previous JPA implementations. While JPA is capable of automatically creating relational tables and can work with a series of relational database vendors, I will part from having pre-existing data deployed on a MySQL relational database, in addition to relying on the Spring framework to facilitate the use of the JPA. This will not only make it a fairer comparison, but also make the described techniques appealing to a wider audience, since performance issues become a serious concern once you have a large volume of data, in addition to MySQL and Spring being a common choice due to their community driven i.
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These metrics will be critical to our performance analysis, since they will shed light on the underlying operations performed by a JPA implementation and in the process show the effectiveness or ineffectiveness of certain techniques. In this area you will find the first differences among implementations, and I'm not talking about metric results, but actually how to obtain these metrics. Set "Number of opened editors before closing" to 2. Open Java editor 1 and change something without saving.
Open Java editor 2 and make a change too without saving.
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Open Java editor 3. On step 3 you will get the "Close Editor Automatically" Dialog. If you choose to open a new editor, all is fine: But if you 4.
Comment 10 Douglas Pollock There might be separate bugs with the same symptomsor at least different ways of triggering the same bug. Comment 11 Susan McCourt It is easily reproducible in the I build, but is not reproducible in the N build. Note that the following is also true: The undo context menu in the editor shows the expected state.
This is what makes me think that a subtle problem has been introduced somewhere else. Have there been any changes in action bar or global action handler code that may have caused this?
I can look into this further after the integration build, but I feel that changes elsewhere have caused it. I don't know what build Sascha is running, but the symptoms describe there sound exactly like bug and bug Comment 12 Susan McCourt