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The import cannot be resolved

 
moshi cochem
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posted 14 years ago
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Hi there,
I develope a jsp using eclipse, and try to call a jar file that I made.
The problem is that when I import the jar into the jsp page, I get an error says:
'The import myClass cannot be resolved'.
I included the jar in the Libraries in the build path. The class I'm trying to use in the jar is public.
I also read that running a 'clean' action (project -> clean) can solve it, and I did it. It didn't solve
my problem.
I still get The import cannot be resolved error.
I'll be glad to here any idea, I didn't find a solution yet :-(
Thanks.
 
Ulf Dittmer
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posted 14 years ago
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Any jar file you want a web app to use needs to be inside of that web app's WEB-INF/lib folder.
 
moshi cochem
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Hi, thanks for your advice.
Well, that is what I put my jar inside the lib in the web project, but it is still not working:
Actually, the jar contains some classes that some of them are recognizad in the "import",
but the class that I built and want to use is not recognized.
I don't know why, driving me crazy !
The both classes are public.
Thanks for any help
 
Ulf Dittmer
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posted 14 years ago
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Are you certain that there isn't a typo in the import directive?
 
moshi cochem
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I'm sorry , I'm not sure what is a typo in the import directive....
if you could explain where can I see that.
thanks
 
Ulf Dittmer
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A typo is a spelling mistake: http://en.wikipedia.org/wiki/Typographical_error
 
moshi cochem
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ok, so I tried it again an now I put my class in import:
<%@page import="hasp_demo"%>
and I can use it, I did:
document.write(<%=hasp_demo.main(new String[1]) %>); just for a test - it autocompletes the methods in hasp_demo,
so I understand that it recognizes this class.
the problem is that in the import line, it red underlines the "hasp_demo" and when I pass the mouse over the red line, it
writes: "The import hasp_demo cannot be resolved". Moreover - when I run my jsp file, I get exception:

org.apache.jasper.JasperException: Unable to compile class for JSP:

An error occurred at line: 6 in the generated java file
The import hasp_demo cannot be resolved

An error occurred at line: 11 in the jsp file: /test.jsp
hasp_demo cannot be resolved
8: <title>Insert title here</title>
9: </head>
10: <body>
11: document.write(<%=hasp_demo.main(new String[1]) %>);
12: cat
13: </body>
14: </html>


Stacktrace:
org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:92)
org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:330)
org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:423)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:308)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:286)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:273)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:566)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:317)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)

I hope that I suplied all the required data to help me.
Thanks a lot.
 
Ulf Dittmer
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You should always use classes that are in packages; don't use the default package (i.e, no package), especially not in JSPs.
 
moshi cochem
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just to know - could you explain why ?
thanks
 
Ulf Dittmer
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The short explanation is "because classes that are not in packages don't work as JSP beans (and in some other contexts)", the longer explanations have to do with code maintenance reasons (like polluting the global namespace) and some arcane JVM internals.
 
Jesper de Jong
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posted 14 years ago
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You cannot import classes that are in the default package; this doesn't even work in standard Java (i.e. not in a JSP). If you try something like this:\

then you will get a compiler error.

(Note: This was possible in older versions of Java, but Sun removed this in Java 5 - probably it was never meant to be possible).

Jesper's Blog - Pluralsight Author Page

 
moshi cochem
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Good morning guys, I'm back :-)
Well, I created again my jar, but now - as you suggested - I put my class inside of a new Package. (Not the default package, but a new one).
The problem is that I can't run it in console - I write: java -jar myJar.jar (like I did before - when the class was out of package), and I get:
Exception in thread "main" java.lang.NoClassDefFoundError....
Any idea ?
Tnks !
 
moshi cochem
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Ok ,
so write now it seem that my class is recognized !
BUT.... when I run my jsp, I get an exception that I have no clue what it says:
The server encountered an internal error () that prevented it from fulfilling this request.

exception
org.apache.jasper.JasperException: javax.servlet.ServletException: java.lang.NoClassDefFoundError: Hasp/hasp_demo
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:541)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:417)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)

root cause
javax.servlet.ServletException: java.lang.NoClassDefFoundError: Hasp/hasp_demo
org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:850)
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:779)
org.apache.jsp.test_jsp._jspService(test_jsp.java:75)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:393)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)

root cause
java.lang.NoClassDefFoundError: Hasp/hasp_demo
org.apache.jsp.test_jsp._jspService(test_jsp.java:65)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:393)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)


Could someone help me with it ?
TNKS
 
Ulf Dittmer
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Post the layout and contents of the WEB-INF/classes and WEB-INF/lib directories.
 
moshi cochem
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Hi , thanks for your reply.
I changed the class inside the jar, to start with capital later. I thought that it has something to do with it.
my class: HaspDemo is inside the package: Hasp.
my code inside the jsp is:

<%@page import="Hasp.HaspDemo"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<%= HaspDemo.CheckFlow() %>
</body>
</html>

(CheckFlow() is a static method).

The error I get is:

An error occurred at line: 6 in the generated java file
Only a type can be imported. Hasp.HaspDemo resolves to a package

An error occurred at line: 16 in the jsp file: /test.jsp
HaspDemo cannot be resolved

13: <title>Insert title here</title>
14: </head>
15: <body>
16: <%= HaspDemo.CheckFlow() %>
17:
18: </body>
19: </html>

inside the lib I have the jar that I created.

Thanks.
 
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