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I'm following this tutorial about using Google engine API to create web application. When I add any file with .jsp suffix into my war folder the project will not compile any more. enter image description here

What can be the reason ? If you need more information please just leave some comment. Thank you.

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  • Uhm, what happens if you just press Proceed? Otherwise this question makes very little sense to me, sorry. Commented May 2, 2011 at 22:55
  • @BalusC if I press proceed it will run previous version of the application as if there were no guestbook.jsp. Commented May 2, 2011 at 22:59
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    What errors exactly are there according to Eclipse? Commented May 2, 2011 at 23:00
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    That would be a good bet. Try installing the EE version over the existing version. Commented May 2, 2011 at 23:06
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    Error details are available in the Markers tab in the bottom view. Commented May 2, 2011 at 23:13

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Can it be that I it cannot compile because I did not download "Eclipse for Java EE developers" but only "Eclipse for Java developers" ?

I'm not sure. I see <Java EE> in the title bar in your Eclipse screenshot which is typical for Eclipse for Java EE developers. So you have likely the right version. If you are able to do File > New > Dynamic Web Project then you definitely have the Java EE version or at least the one with WTP. More detail can be found in Help > About Eclipse.

the error in Markers tab is "Your project must be configured to use a JDK in order to use JSPs"

You need to install the JDK. Go to the Java SE download home page and click the leftmost one of the four big buttons. Done that, go in Eclipse to Windows > Preferences > Java > Installed JREs, select the existing JRE, click Edit and let the JRE home path point to the JDK folder.

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+1 exactly, that was the problem. I figured it out myself and wanted to post my own answer here but I did not have time and you did it so I'll accept your question in time. I did not have to download JDK I already had it but Eclipse just did not use it - it installed its own JRE instead.
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It it asking you if you want to run even though it found errors in the project. First, what are the errors and can you fix them easily? Eclipse gives pretty good error messages. If the errors are from validation, turn them off in the project settings, then try running the project again.

Otherwise, double check that you are using the exact code from the tutorial. Copy the code from Google and save it into a separate file. Then select your file, and the new file, right-click on the two files and use Eclipe's file-compare to show you if you missed anything.

[edit] You could install the EE version to a different directory. Different versions of Eclipse do play nice with each other, they're just huge. Do not import your project into the EE workspace. It will come across as a plain Java project and you need a Web project. Create a new Web/JSP project and then copy the files over.

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I copy pasted code from google tutorial into the guestbook.jsp file and to be sure I also copy-pasted the name of the file itself. As to error messages - see my comment to the question (above). There are non in the fact :(. Validation run explicitly on the guestbook.jsp (right click on file-> Validate) gives following message: Validation completed with no errors or warnings.

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