Java error cannot access class

following is code of my programme

Library.java
import coreservlets.*;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class Library extends HttpServlet {

public void doPost(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
String emailAddress = request.getParameter(«emailAddress»);//use to email&pass
String password = request.getParameter(«password»);//from html page

int a=LibraryStudent.findStudent(emailAddress, password);//to validate student
if (a=0) {
gotoPage(«/library/accounts.jsp», request, response);
}

student.setBookName(request.getParameter(«sname»));//use to sent other textbox
student.setBookName(request.getParameter(«bname»));//data in librarystudent
student.setDate(request.getParameter(«date»));//class after validation
HttpSession session = request.getSession(true);
session.putValue(«student», student);
//for moving different page
if (request.getParameter(«issue») != null) {
gotoPage(«/travel/issue.jsp»,
request, response);
} else if (request.getParameter(«sumbit») != null) {
gotoPage(«/travel/sumbit.jsp»,
request, response);
} else if (request.getParameter(«search») != null) {
gotoPage(«/travel/search.jsp»,
request, response);
} else if (request.getParameter(«account») != null) {
gotoPage(«/travel/EditAccounts.jsp»,
request, response);
} else {
gotoPage(«/travel/IllegalRequest.jsp»,
request, response);
}
}
private void gotoPage(String address,
HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
RequestDispatcher dispatcher =
getServletContext().getRequestDispatcher(address);
dispatcher.forward(request, response);
}
}
LibraryStudent.java
package coreservlets;
import java.util.*;
import java.text.*;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;
import java.util.*;

public class LibraryStudent {

private String emailAddress, password, sname,bname;
private String date,value;

public String getStudentName() {
return(sname);
}
public void setStudentName(String sname) {
this.sname = sname;
}
public String getEmailAddress() {
return(emailAddress);
}
public void setEmailAddress(String emailAddress) {
this.emailAddress = emailAddress;
}
public String getPassword() {
return(password);
}
public void setPassword(String password) {
this.password = password;
}

public String getBookName() {
return(bname);
}
public void setBookName(String bname) {
this.bname = bname;
}
public String getDate() {
return(date);
}
public void setDate(String date) {
this.date = date;
}
public String getIssueData() //method that create connection withh database
throws ServletException,IOException{
try{
getDate(); //and add a entry in database
getBookName();
getStudentName();
Class.forName(«sun.jdbc.odbc.JdbcOdbcDriver»);
Connection con=DriverManager.getConnection(«jdbc:odbc:db2»);
Statement st=con.createStatement();
String sql =
«insert into table1 (bookname,studentname,date) values(bname,sname,date)»;
st.executeUpdate(sql);
System.out.println(sql);

return «your book has been issued «;

}
catch(Exception e)
{
e.printStackTrace();
return «failed»;
}
}

public String getSumbitData()
throws ServletException,IOException{
try
{
getBookName();
getStudentName();
Class.forName(«sun.jdbc.odbc.JdbcOdbcDriver»);
Connection con=DriverManager.getConnection(«jdbc:odbc:db2»);
Statement st=con.createStatement();
String sql =
«delete from db2 where bookname=’bname’ and studentname=sname»;
st.executeUpdate(sql);
System.out.println(sql);

return «your book has been sumbitted «;
}
catch(Exception e)
{
e.printStackTrace();
return «failed»;
}
}

public static int findCustomer //to validate customer
(String emailAddress,
String password) throws ServletException,IOException{
try
{
if (emailAddress == null) {
return(0);
}
Class.forName(«sun.jdbc.odbc.JdbcOdbcDriver»);
Connection con=DriverManager.getConnection(«jdbc:odbc:user»);
Statement st=con.createStatement();
String sql=»select * from user where name='»+emailAddress+»‘ and password='»+password+»‘»;
System.out.println(sql);
ResultSet rs=st.executeQuery(sql);

if(rs.next())
return(1);
else
return(0);
}catch(Exception e)
{
e.printStackTrace();
return (0);}
}
}

and error is «Library.java:15: cannot access LibraryStudent
bad class file: .LibraryStudent.class
class file contains wrong class: coreservlets.LibraryStudent
Please remove or make sure it appears in the correct subdirectory of the classpa
th.
int a=LibraryStudent.findStudent(emailAddress, password);//to validate student
^
1 error» plz help me and tell how i run this project on server

thanks

bad class file error when it read class file .

I got some very interesting problems.

I’ve got two source files:

package pack;
public class Hello
<
public static void fun(String[] args)
<
System.out.println(«Hello World!»);
>
>

class Use
<
public static void main(String[] args)
<
Hello.fun();
>
>

I compiled Hello.java using the command : javac -d . Hello.java
it worked well and I got the class file in the folder «pack» in the working directory.

In the working directory, I have Use.java, the folder «pack» that contains Hello.class and a folder «source» that contains «Hello.java».

when I try to compile Use.java, I get the following error:

Use.java:5: cannot find symbol
symbol : variable Hello
location: class Use
Hello.fun();
^
1 error

To clear this, I tried to use CLASSPATH environment variable to point to Hello.class that is present in the folder «pack».

to the existing CLASSPATH value of

Program FilesJavajre1.5.0_16librt.jar;D:Program FilesApache Software FoundationTomcat 5.5commonlibservlet-api.jar;.;D:oraclexeapporacleproduct10.2.0serverjdbclibojdbc14.jar

I added C:pack by the following command:

And then again I tried to compile Use.java without providing the import statement as

and I got the following error:

Use.java:5: cannot access Hello
bad class file: C:packHello.class
class file contains wrong class: pack.Hello
Please remove or make sure it appears in the correct subdirectory of the classpath.
Hello.fun();
^
1 error

Can anyone please help me out with this.

Here’s a tutorial on using packages [http://java.sun.com/docs/books/tutorial/java/package/index.html]

You have at least a couple of problems. (1) The Use class is in a different package from the Hello class. So you either need to «import pack.Hello;» or you need to refer to Hello with its fully qualified name like «pack.Hello.fun();» (2) You need the root directory of the package, not the .class file, in your classpath. If the current directory is in the classpath, and the ‘pack’ directory is in the current directory, then you do not need to do any additional classpath setting.

Thank you very much for the reply.

I want to explain.

I actually know that I have to import that class «Hello» or use the fully qualified name of Hello to use that in the class Use.java to use it.

I was just learning how the java compiler works . the hard way..

As you kindly pointed out in your second point, that I need not do any additional classpath setting if I have my «pack» directory in the current directory. I have the «pack» directory in the current directory.

I think it is making some difference in me adding the folder C:pack to the classpath than it without being added to the classpath as two DIFFERENT errors are being displayed during the compilation.

error . without specifying C:pack in the classpath:

Use.java:5: cannot find symbol
symbol : variable Hello
location: class Use
Hello.fun();

error when C:pack is specified in the classpath:

Use.java:5: cannot access Hello
bad class file: C:packHello.class
class file contains wrong class: pack.Hello
Please remove or make sure it appears in the correct subdirectory of the classpath.
Hello.fun();
*^*
*1 error*

If I did not remove the Hello.java file from my current directory, the java compiler tries to read the Hello.java file ‘thinking’ it to be the class file. and hence the «bad class file error» in this case.

But in my case, the java compiler is trying to read the class file that it actually needs here .. Hello.class but again showing that it is a bad class file.

Use.java:5: cannot access Hello
bad class file: C:packHello.class
class file contains wrong class: pack.Hello
Please remove or make sure it appears in the correct subdirectory of the classpath.
Hello.fun();
^
1 error

From what I have learnt of the java compiler, it searches for the class files in the following sequence:

1. ext folder of jre
2. the current working package
3. the packages that we specified in the import statements
4. the folders that are specified in classpath that are not already covered in the above three places

Источник

bad class file error. Please help me

I got a problem that is very strange. I have two source files saved in the same directory: E:Java Programmes

First one: A.java Second one: B.java I compiled these two files and got problem as follow:

*compiling file A.java is ok, no problem.
E:Java Programmes>javac -d «E:Java Programmes» A.java

*but got problem with B.java
E:Java Programmes>javac B.java
B.java:5: cannot access A
bad class file: .A.java
file does not contain class A
Please remove or make sure it appears in the correct subdirectory of the classpa
th.
A a = new A();
^
1 error

*The strange thing is that when i modify the file B.java as follow, it can run well
Output = Result: 8.

I keep wondering why it is like that. Because the statement «import util;*; » does not work well while the statement import «util.A ; » can work well. Please, anyone, explain it to me. Thannks a lot.

I compiled these two files and got problem as
follow:

*compiling file A.java is ok, no problem.
E:Java Programmes>javac -d «E:Java Programmes»
A.java

This should create E:Java ProgrammesutilA.class. Correct?

When you use «import util.*; » and the compiler finds a reference to a class named A, it does not know that you mean util.A class. It looks for A, finds the A.java file and tries to use it. When you use «import util.A; » it knows to look for a utilA.class or utilA.java file.

If you want to separate the source code files from the .class files, you should not have the source code files in the Classpath. If you have .java files in the Classpath, put them into the correct directory structure.

import.* is a way to tell the compiler that some of the references to classes in your code might be found in that package. When you have the javac compiler does not explicitly know that the class is util.A. It has to search through the Classpath directories to find a suitable .class or .java file. In your case, the Classpath includes E:Java Programmes. When the compiler looks in that directory, it apparently finds the A.java file before it finds the utilA.class file. The A.java is suitable as far as the compiler is concerned. It then tries to compile the source code, but when it does, it finds that the file contains util.A, not plain A as expected. The javac compiler is not smart enough to keep looking for a better .class or .java file.

When you use «import util.A;» the compiler knows that A.java is not suitable since it is not in a util directory.

If you move the A.java file into the util directory, you can make it work. Or, move the A.java file into a directory which is not in the Classpath.

javac searches the Classpath for a suitable .class file. By suitable, I mean that the file path relative to the Classpath matches the package name. All classes in Java have a fully qualified class name. The fully qualified name is the package name plus the class name. The .class file must reside in a directory structure matching the package name, relative to the Classpath.

In your case, the fully qualified class name is util.A. So somewhere on your computer (or in a jar file), there must be a directory named util and the A. class file must be in it. The util directory must be in a directory that is in the Classpath.tells javac to look inside e:Java Programmes when looking for classes and packages. For a class named util.A javac will look in E:Java Programmes for a util directory that contains A.class.

cut this and paste in your cmd prompt and then run your code..

(its javac [space] -d [space] . [space] A.java)

then you run your program.it ll work.

do reply if it works;)

Edited by: sanjay_gates on Oct 3, 2007 1:07 AM

It’s not likely that anyone will reply to a message that is 2 years old. Also, I’m not sure your solution would fix the problem.

Источник

Bad Class File Error. What am i doing wrong?

I am trying to run a ‘Hello World’ program which came with the FreeTTS package from links from the java.sun.com website, and am not able to compile the program. I get the error:

FreeTTSHelloWorld.java:4: cannot access
cl.com.sun.speech.freetts.audio.Voice
bad class file: .clcomsunspeechfreettsaudioVoice.class
class file contains wrong class: com.sun.speech.freetts.Voice
Please remove or make sure it appears in the correct subdirectory of the classpath.
import cl.com.sun.speech.freetts.audio.Voice;
_______________________________________^

The FreeTTSHelloWorld.java File is printed below [its embarassingly simple..]

/**
* Copyright 2001 Sun Microsystems, Inc.
**/
import cl.com.sun.speech.freetts.audio.Voice;
import cl.com.sun.speech.freetts.audio.JavaClipAudioPlayer;
import cl.com.sun.speech.freetts.en.us.CMULexicon;

public class FreeTTSHelloWorld <
public static void main(String[] args) <
try <
String voiceClassName = (args.length > 0) ? args[0] :
«com.sun.speech.freetts.en.us.CMUDiphoneVoice»;

Class voiceClass = Class.forName(voiceClassName);

Voice helloVoice = (Voice) voiceClass.newInstance();

helloVoice.speak
(«Thank you for giving me a voice. I’m so glad to say
hello to this world.»);

System.exit(0);
>
catch (Exception e) <
e.printStackTrace();
>
>
>

I’ve tried a billion things, including moving around the .class files [which, by the way, i extracted myself from the .jar files which came with the FreeTTS package — is that what i’m doing wrong? if so, please tell me — ] and still nothing happens — the same error results.

I’ve tried reading other cases similar to mine in the forums, but most of the things i read didn’t apply to my (quite simple) situation, such as the ‘package’ line needing to be removed or anything like that..

I run Win2k and have j2sdk1.4.0_01 installed on my machine

I beg for anyone’s help. Thanks in advance
-=Miagi=-

first make sure that the CLASSPATH environment variable points to the directory where the class files reside.
i.e.
if my java program has: and my class files reside in:
«c:My Java Classesameyerutil»
then my CLASSPATH variable should point to:
«c:My Java Classes»

another option is to leave the files in the jar and include the full path to the jar file in the class.
using the above example if I had all of my classes in a file called
Utilities.jar sitting in «C:My Java Classes»
then my CLASSPATH would be «C:My Java ClassesUtilities.jar»

also make sure that the import matches the directory structure
if I tried to use: it would not work.

hope this helps.

The error is not a class not found error.

Consequently it has nothing to do with the class path.

It specifically tells you what the problem is.

There are two components to this problem: the file and the class.

There is a file (not a class) like so

There is a class in that file called this.

Notice in the above that the file has «audio» in it. The class does not.

That means something is wrong.

The most likely problem is that you moved the file either intentionally or accidently. (You could even have two copies of the file.)

If this isn’t your code then some one else caused the problem.

The fix is to put the file in the right place. Or to change the package of the class (in the source code) and then recompile.

please leave the class files in the .jar-files, just add the .jar files to your classpath. That way you can’t mess around with directory structures among other things that makes the life of a ClassLoader difficult

Hey guys.
I have the exact same problem — but unfortunately your solution doesn’t work for me, because I believe my class is in the correct directory.

Here’s the error message:
Generated servlet error:
bad class file: C:TomcatwebappstestWEB-INFclassesjavabeansUserInfo.class
class file contains wrong class: UserInfo
Please remove or make sure it appears in the correct subdirectory of the classpath.
javabeans.UserInfo bean99 = null;

This occurs because of the following line in my index.jsp file:

The weird thing is, I’ve called many other bean files in the exact same directory — the following actually works fine:

My bean file is the world’s simplest file:
package javabeans;

public class UserInfo <
public String UserID=»»;
public String UserName=»»;
>

while other, more complicated files work fine.

any suggestions are helpful

Same problem, different reason.

Look at the original error from the first post.

bad class file: .clcomsunspeechfreettsaudioVoice.class
class file contains wrong class: com.sun.speech.freetts.Voice

Notice how the first part has a directory structure and a file name.
Notice how the second part has a package name which looks similar to the directory structure.

Now we look at your error.

The first part has a directory structure and a class file.
The second part has no package structure at all.

You have jar’d a file in a directory structure even though the class does not have a package. That doesn’t work.

Hi Everybody,
I have the same problem. When I try to compile HelloAgent.java, following error occurs:
C:kaaribogasource>javac org/kaariboga/agents/HelloAgent.java
org/kaariboga/agents/HelloAgent.java:41: cannot access org.kaariboga.agents.Histo
bad class file: .orgkaaribogaagentsHisto.class
class file contains wrong class: Histo
Please remove or make sure it appears in the correct subdirectory of the classpath.
Histo myApplet = new Histo();
^
1 error

HelloAgent code:
.
.
public void run() <
Histo myApplet = new Histo();
Frame myFrame = new Frame(«Work»);
myApplet.init();
myApplet.start();
myFrame.setSize(200,200);
myFrame.setLocation(100,100);
myFrame.add(myApplet, BorderLayout.CENTER);
myFrame.setVisible(true);

if (trips > 0) fireDestroyRequest();
>
.
.

Источник

To fix the “java.lang.IllegalAccessError: class lombok.javac.apt. LombokProcessor cannot access class com.sun.tools.javac.processing. JavacProcessingEnvironment” error in Java, there are several solutions we have tested that work. Follow the article to better understand.

What causes the error?

The error happens because you use the Lombok plugin to generate setters and getters for the area of ​​a particular category. I have the following solutions.

Use @Data( Lombok)

If you want to instantiate an Information class with full functions like getter, setter, toString, equals, hashCode and constructor, it will take a lot of time and cumbersome syntax. So I would suggest you use @Data to generate the above functions automatically during chapter building so you can optimize your time and focus on the more essential parts.

Example:

import lombok.Data;
@Data
public class Information {
    private String fullname;
    private Long id;
}

Update your Lombok

Lombok is a library in Java that automatically generates functions like setters/getters, constructors, and toString,…

The outstanding advantage of the Lombok library is that it helps to streamline the lengthy code of frequently repeated operations such as setters/getters and constructors to help programmers optimize working time.

If you get this error, please update your Lombok to at least version 1.18.20, so the program can run smoothly.

To use Lombok annotations, we add the Lombok dependency to pom.xml:

Example:

<dependency>
    <groupId>org.projectlombok</groupId>
    <artifactId>lombok</artifactId>
    <version>1.18.20</version>
    <scope>provided</scope>
</dependency>

Or you can download it at https://projectlombok.org/download.

Add Plugin to pom.xml

You can add Plugins to pom.xml able to resolve the error.

Example:

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-compiler-plugin</artifactId>
    <version>3.8.1</version>
    <configuration>
        <source>16</source>
        <target>16</target>
        <!--                    <release>16</release>-->
        <fork>true</fork>
        <compilerArgs>
            <arg>--enable-preview</arg>
            <arg>-Xlint:all</arg>
            <arg>-J--add-opens=jdk.compiler/com.sun.tools.javac.code=ALL-UNNAMED</arg>
            <arg>-J--add-opens=jdk.compiler/com.sun.tools.javac.comp=ALL-UNNAMED</arg>
            <arg>-J--add-opens=jdk.compiler/com.sun.tools.javac.file=ALL-UNNAMED</arg>
            <arg>-J--add-opens=jdk.compiler/com.sun.tools.javac.main=ALL-UNNAMED</arg>
            <arg>-J--add-opens=jdk.compiler/com.sun.tools.javac.model=ALL-UNNAMED</arg>
            <arg>-J--add-opens=jdk.compiler/com.sun.tools.javac.parser=ALL-UNNAMED</arg>
            <arg>-J--add-opens=jdk.compiler/com.sun.tools.javac.processing=ALL-UNNAMED</arg>
            <arg>-J--add-opens=jdk.compiler/com.sun.tools.javac.tree=ALL-UNNAMED</arg>
            <arg>-J--add-opens=jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED</arg>
            <arg>-J--add-opens=jdk.compiler/com.sun.tools.javac.jvm=ALL-UNNAMED</arg>
        </compilerArgs>
        <!--for unmappable characters in classes-->
        <encoding>UTF-8</encoding>
        <showDeprecation>true</showDeprecation>
        <showWarnings>true</showWarnings>
        <!--for lombok annotations to resolve-->
        <!--contradictory to maven, intelliJ fails with this-->
        <annotationProcessorPaths>
            <path>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
                <version>1.18.16</version>
            </path>
        </annotationProcessorPaths>
    </configuration>
</plugin>

Downgrade the current Java version

If you have installed the Lombok library and still get the “java.lang.IllegalAccessError: class lombok.javac.apt.LombokProcessor cannot access class com.sun.tools.javac.processing.JavacProcessingEnvironment” error, then I think you should downgrade your Java version. Maybe the error will be solved.

Summary

Please read this article if you encounter “java.lang.IllegalAccessError: class lombok.javac.apt.LombokProcessor cannot access class com.sun.tools.javac.processing.JavacProcessingEnvironment” in Java. If you have any questions about this issue, leave a comment below. I will answer your questions. Thanks for reading!

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