Access default package

Is it posible to access a class in default package from the some package called
MyPackage
if its not possible means why?
thanx in advance

why its not allowing to access?, is there practical
problem to find the current folder while loading the
classI guess it's to discourage from usage of the default package.
You can't import the default package. It's not something that would be hard to implement. Classes in the default package were actually accessible in the first versions of Java.
Kaj

Similar Messages

Not able to access default package classes in own package

I created a class called Constant.java in default package(no package ).
I have Connection.java in util package.
I am trying to use the Constant.java in my Connection.java like below..
public class Constant
public static final String NEW = "01";
package util;
import Constant;
public class Connection
I am unable to compile the class Connection. My question here is Won't I able to access default package in my util package.. ?

java_guy04 wrote:
Djaunl , I understand.
but, Will I able to access default package in my util package.. ? is this correct.No, you won't be able to use classes out of the "default" package.
Because, AFAIK, if you use a classname that you haven't imported, Java automatically attempts to locate this class in the same package as the current class. It does not check the "default" package (unless that is also the current package), and since the "default" package does not have a package name, you can't import those classes either.

Accessing default package in own package ****

I created a class called Constant.java in default package(no package ).
I have Connection.java in util package.
I am trying to use the Constant.java in my Connection.java like below..
public class Constant
public static final String NEW = "01";
package util;
import Constant;
public class Connection
I am unable to compile the class Connection. My question here is Won't I able to access default package in my util package.. ?

You indeed can't import from the default package.

Default/package/none access modifier

Hi,
I was hoping for some discussion on the default/package/none access modifier. It's always really bugged me that we have public, private, protected, and then "none", while it seems to me that it would be less confusing, and more consistent to use the keyword "package", or maybe even "default".
Then, source code would look like
public class MyClass{
    public int getValue() {}
    private void setValue() {}
    protected void someMethod() {}
    package int justForPackage() {}
}I know this concept has come up before, but the books I've read which mention this topic haven't offered any actaul justification/explanation for why there isn't some keyword.
Anyway, are there any insights as to why java is this way, and any reasons why java should or shouldn't be changed to include the package access modifier.

A good example is within a tightly grouped package (usually should be this way) you may have some cooperative classes that access methods.
// one .java file
public class SomeHelper {
   private void method() {
     new ClassForUsers().accessHiddenLogic();
// next .java file in same package
public ClassForUsers {
    /* default-access */ void accessHiddenLogic() {
}But, you may want to allow users to subclass your ClassForUsers, without giving them access to the hidden logic method directly:
// another .java file in a different package
public class UsersSubclass extends ClassForUsers {
    public void userMethod() {
        // can't do this
        accessHiddenLogic();
}This could be for either business logic or security reasons. So, package level access can be very useful. However, I've seen that in practice it is avoided because it isn't obvious what is going on.

Access Class in Default Package

Make long story short, I have to have some class in the "(default package)", related to JNI, and I will need to pass data back and forth from and to these classes from some packaged classes. I am using Java 1.4. As I know since Java 1.4, it's not possible to access classes in default package from packaged classes directly. Is there a work around? please help...

I DON'T have the C/C++ codeSo you have to do with the "old" classes in the default package.
Then use jschell's suggestion to devise proxying code that allow bridging between the packages.
since Java 1.4, I can't call the java class in the default package from packaged class any moreIf I understand jschell's post, this restriction is enforced by the Java compiler , not by the Java interpreter (JVM). Indeed this is specified in the JLS (Java Language Specifications, http://java.sun.com/docs/books/jls/third_edition/html/packages.html#7.5), not the JVM specifications (I have not verified that latter point).
So if you get an older JDK (before 1.4 they would accept the construct), you can try writing proxy classes within a named package, proxying to the old classes in the unnamed package. Once they are compiled, and jarred together for convenience, you can switch back to the current compiler (let's says 1.6) to compile the rest of your application classes, which only use the classes in the named package, using the jar as a library.
When executing the program, the JVM will execute everything without complaining, since it supports execution of compiled code that has been compiled with former versions.

Trying to page import directive in a JSP access a class in default package

I am trying to import a class the is in my default package directory for Tomcat 4.1.18 (context-root\web-inf\classes\*.java). I am getting the following error
This is error using Tomcat 4.1.18
org.apache.jasper.JasperException:Unable to compile class for JSP
C:\Program Files\Tomcat4.1\work\Standalone\localhost\csc297\HTML\SearchByName_jsp.java:9: '.' expected
import Product;
C:\Program Files\Tomcat4.1\work\Standalone\localhost\csc297\HTML\SearchByName_jsp.java:10: '.' expected
import Category;
This is error using Tomcat 4.0.6
org.apache.jasper.JasperException: Unable to compile class for JSPNote: sun.tools.javac.Main has been deprecated.
C:\forte4j\tomcat401\work\localhost\C_3A_5Cforte4j_5Ctomcat401_5Cwebapps_5Ccsc297\HTML\SearchByName$jsp.java:5: Class Product not found in import.
import Product;
^
C:\forte4j\tomcat401\work\localhost\C_3A_5Cforte4j_5Ctomcat401_5Cwebapps_5Ccsc297\HTML\SearchByName$jsp.java:6: Class Category not found in import.
import Category;
Here is snippet of code from my JSP:
<%@ page import= "java.util.*"%>
<%@ page import= "java.text.DecimalFormat"%>
<%@ page import="Product"%>
<%@ page import="Category"%>
Remember these classes are in my default package of my context-root
Any ideas would greatly appreciated

Weird error. Never seen this one before.
Try packaging your classes eg:package myClasses;and import them:<%@page import="myClasses.*"%>Should fix the problem.
Anthony

Importing class from default package of a JAR

I want to create objects of a class contained in a JAR. The JAR has many classes in numerous packages, however the class that I want to use is in the default package. I'm using eclipse and have added the JAR to the build path, but eclipse complains that the class name cannot be resolved. Is there some way to specify an import statement to look in the default package of a particular JAR? Any advice is appreciated.

jg2009 wrote:
I was under the impression that classes without a defined package were technically considered to be part of the so-called default package. But, in answer to your question, yes this class does not appear to part of any package.
Just to provide so additional information, the class that I want to instantiate is an Applet, so it is designed to be called from an html object tag, and have access to all of the other classes in its JAR. There is a system that provides access to underlying data via the following components: html form <-> javascript <-> applet <-> serverlets <-> data
I want to automate certain data operations, but the only way to access the underlying data is via the applet. Am I out of luck, or is there some way that I can instantiate the applet?All jverd said is right, assuming it is your code and you can change it: basically move everything to a package. But I think your problem is that the jar is a 3rd party jar and you cannot change it. If this is the case, you can use the 'default package' (the terminology is correct) by having your own class(es) in the default package or by using reflection (last time I tried reflection would work). Both are rather bad solutions, but if you really, really want...
Note: Java actively discourages the use of the 'default package' and more so recently, this is why I am not even sure that reflection would still work.

To access a package, the calling class must reside in the root/parent direc

My goal was to be able to access my package from anywhere within the
high level root folder (d:\zJava). But it seems the invoking class MUST
RESIDE IN THE TOP LEVEL PARENT DIRECTORY of the package. Was Java
designed to behave this way?
D:\zJava\zsamples\com\zswingpackage1>     <-- packages successfully compiled here
     swing_optgrp_eg1.{class/java}
          package com.zswingpackage1;
          public class swing_optgrp_eg1 extends JFrame implements ItemListener {
D:\zJava\zsamples\com> <-- classes residing here could NOT successfully                    access the package 'com.zswingpackage1'. The third                    level subfolder is 'com'.
     package_test4.java
          /* Following import stmt. causing RUN-TIME error "Exception in thread     "main" java.lang.NoClassDefFoundError: com/zswingpackage1/swing_optgrp_eg1". */
          import com.zswingpackage1;
     Package_Test4.class
     /* Unsuccessful remedies:
     i) D:\zJava\zsamples\com>java Package_Test4
               -classpath .;d:\zJava\zsamples\com\zswingpackage1
               -classpath .;d:\zJava\zsamples\com
               -classpath .;d:\zJava\zsamples (also used in compile)
               -classpath .;d:\zJava
     ii) ran from the root/parent directory of the package d:\zJava\zsamples),with and without classpath i.e.
          D:\zJava\zsamples>java com\Package_Test4 [-classpath .;d:\zJava\zsamples]
     iii) ran from the top level directory (d:\zJava), with and without classpath i.e.
          D:\zJava>java zsamples\com\Package_Test4 [-classpath .;d:\zJava\zsamples]
     Possible causes:
          - maybe the above behaviours are by design i.e. the calling class/program CANNOT be stored within the package hierarchy?
D:\zJava\zsamples\net> <-- classes residing here could NOT successfully access the package 'com.zswingpackage1'. The third level subfolder is 'net'.
     package-test6.java
          /* Following import stmt. causing RUN-TIME error "Exception in thread "main" java.lang.NoClassDefFoundError: com/zswingpackage1/swing_optgrp_eg1". */
          import com.zswingpackage1;
     Package_Test6.class
     /* Unsuccessful remedies:
     i) D:\zJava\zsamples\net>java Package_Test6
               -classpath .;d:\zJava\zsamples\com\zswingpackage1
               -classpath .;d:\zJava\zsamples\com
               -classpath .;d:\zJava\zsamples (also used in compile)
               -classpath .;d:\zJava
     ii) ran from the root/parent directory of the package (d:\zJava\zsamples), with and without classpath i.e.
          D:\zJava\zsamples>java net\Package_Test6 [-classpath .;d:\zJava\zsamples]
     iii) ran from the top level directory (d:\zJava), with and without classpath i.e.
          D:\zJava>java zsamples\net\Package_Test6 [-classpath .;d:\zJava\zsamples]
     Possible causes:
          - maybe the above behaviours are by design i.e. the calling class/program MUST be stored in the parent folder of the package hierarchy?
**D:\zJava\zsamples>     <-- classes residing here SUCCESSFULLY accessed package 'com.zswingpackage1'. NO -classpath parms. were necessary!
D:\zJava\ <-- classes residing here could NOT successfully access the package 'com.zswingpackage1'. Similar scenarios as above.
D:\zJavaB\ <-- classes residing here could NOT successfully access the package 'com.zswingpackage1'. I purposely created another folder with the 'B' suffix. Similar scenarios as above.
My PC configuration:
     java version "1.4.0_01"
     Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.0_01-b03)
     Java HotSpot(TM) Client VM (build 1.4.0_01-b03, mixed mode)
     JRun 4 (Build 47304)
     WinNT 4.0 SP5
     IE 5.50
     CLASSPATH=.;D:\jakarta-tomcat-3.3.1\lib\common\servlet.jar;
          C:\JRun4\servers\default\default-ear\default-war\WEB-INF\classes
     JAVA_HOME=C:\j2sdk1.4.0_01
     Path=C:\j2sdk1.4.0_01\bin;C:\WINNT\system32;C:\WINNT;
          C:\Program Files\Network Associates\PGPNT;C:\Program Files\MTS;d:\MSSQL7\BINN
Thank you so much for your expertise.

Hello,
I think that you use the import-declarations incorrectly.
Your code says:
import com.zswingpackage1;
... The meaning of the above declaration is the following: Import the class "zswingpackage1" from the package "com". The compiler cannot find that class, but it is probably never asked to find it in your code, so it won't report an error.
If you want to import the whole package use the following declaration instead:
import com.zswingpackage1.*;
... That means: import all classes from from the package "com.zswingpackage1".
You can also import just the classes needed, e.g.:
import com.zswingpackage1.swing_optgrp_eg1;
... I hope that does the job.
Søren

Netbeans - refactoring from in a package to the default package

Hello,
I have a problem, I have some JNI code (two .dll's) and a wrapper that connects my java program to an external USB board.
I didn't write the original code, that was done by Mike Peter and the dlls have been compiled so that I can call the JNI functions only in the default package. Whenever I try to put the code in a package of its own, the JNIs stop working. So my problem now is that I want to access this interface class from my code that is in a package.
I don't know how to import the code as a library into my programs package so perhaps a solution might be to de-package my program code so that it can access Mike Peters code.
Trouble is I have used the netbeans GUI editor that does not let me access all the code and I dont know how to refactor the package from being in one to not being in one.
removing the package declartion from my code manually causes lots of errors.
Any ideas?
Mike Peters code downloadable here:
http://www.re-applications.be/downloads/J-K8055-Wrapper.zip
the usb_interface class has no constructor and is not in a package, how do I go about making it a library and importing it?
I'd greatly appreciate it if anyone can help, if more details are needed I can try to provide them but I didn't think it was worth putting up all my code here as there is no real problem with it, just an access issue.

What I really need to do is find a way to import a class from the default package.
I was led to believe that classes in the default package should be readily accessible, however my compiler says otherwise when my code is in a package and the class I want to access can only be accessed when my code is not in a package. This is really frustrating because the GUI editor doesn't like it when the GUI is not in a package... so I either lose and my USB interface doesn't work or I lose and my GUI doesn't work.
help!

Accessing a packaged variable through db link

How do I access a packaged variable remotely? (Syntax)

You cannot do that:
SQL> conn xx/xx@xx
Connected.
SQL> create package p is
2   a number;
3 end;
4 /
Package created.
SQL> conn yy/yy@yy
Connected.
SQL> desc p@yy
SQL> set serveroutput on
SQL> create synonym p1 for p@xx;
Synonym created.
SQL> desc p1;
SQL> begin
2    p1.a := 1;
3    dbms_output.put_line(p.a);
4 end;
5 /
p1.a := 1;
ERROR at line 2:
ORA-06550: line 2, column 6:
PLS-00512: Implementation Restriction: 'P1.A': Cannot directly access remote package variable or cursor
ORA-06550: line 2, column 3:
PL/SQL: Statement ignoredInstead you should access these variables via functions and/or procedures. In following example I've created the private variable in package p but this doesn't matter whether it is private or public.
SQL> conn xx/xx@xx
SQL> create or replace package p is
2 procedure set_a (v in number);
3 function get_a return number;
4 end;
5 /
Package created.
SQL> ed
Wrote file afiedt.buf
1 create or replace package body p is
2 a number;
3 procedure set_a (v in number) is
4 begin
5 a := v;
6 end;
7 function get_a return number is
8 begin
9 return a;
10 end;
11* end;
SQL> /
Package body created.
SQL> conn yy/yy@yy
Connected.
SQL> set serveroutput on
SQL> desc p1
FUNCTION GET_A RETURNS NUMBER
PROCEDURE SET_A
Argument Name Type In/Out Default?
V NUMBER IN
SQL> ed
Wrote file afiedt.buf
1 begin
2 p1.set_a(1);
3 dbms_output.put_line(p1.get_a);
4* end;
SQL> /
1
PL/SQL procedure successfully completed.
Gints Plivna
http://www.gplivna.eu

Can't find default package `javax.imageio' error

We are running jdk "1.4.2_05-b04" on linux. And I have a simple program that is importing package javax.imageio. But the compiler is not finding it. Now since this is a j2ee envrionment I am using ANT to compile. Here is the error I am getting:
--- BEGIN ERROR TEXT---- [javac] /home/sroshan/samcvs/psimc/src/com/psi/psimc/tasks/servlets/StockGraphProducer.java:28:
error: Can't find default package `javax.imageio'.
Check the CLASSPATH environment variable and the access to the archives
[javac] 1 error
--- END ERROR TEXT----
Here are my questions:
1-Any one has any idea why this package may be in a special location in my jdk path that ANT can not find?
2- What jar file would be containing the javax.imageio package?
Since at list I could see if that jar may be included into my ANT classpath or not.
Any help is appreciated
Regards
Siamak

Hi,
hey..I am also getting the same error. Please let me know what do you mean by path was so long??
Are you talking about system Path variable or the installation path?I believe there is no restriction on the system path length, just search for cl.exe and make sure it is included in the system PATH.
Regards,
Hussein

Access Stored Package and Trigger

I first connect to Oracle using my user name (such as TESTER). Once I get connected, I create a package named pkg_test. If I understand it correctly that Oracle will stored it in DBA_SOURCE table, not in my schema. Now, I have some questions regarding to the privilege to access the package.
1) When I want to access the package after I connect to Oracle, I will directly use it without prefix, that is, pkg_test.sp_get_text()... But when other users want to access it, do they need to use the prefix TESTER, that is, TESTER.pkg_test.sp_get_text()?
2) After I connect to Oracle, I create a table named test_tab. This table will be accessible by other users. Then I create a trigger on the table.
create or replace trigger trig_test
for insert on TESTER.test_tab
Do I need to use the prefix TESTER in the trigger so that it will be accessible to other users?
Thanks
Scott

scottjhn wrote:
If I understand it correctly that Oracle will stored it in DBA_SOURCE table, not in my schema. Now, I have some questions regarding to the privilege to access the package.The source will be stored in the data dictionary, yes (it will also be visible in ALL_SOURCE and USER_SOURCE). But the object itself will be stored in the TESTER schema.
1) When I want to access the package after I connect to Oracle, I will directly use it without prefix, that is, pkg_test.sp_get_text()... But when other users want to access it, do they need to use the prefix TESTER, that is, TESTER.pkg_test.sp_get_text()?By default, yes. Oracle will try to resolve objects without schema qualifiers using objects in the current schema.
You can change this default by creating a public synonym for PKG_TEST or by creating a private synonym in each user's schema for PKG_TEST or by running
ALTER SESSION SET current_schema = 'TESTER' when logged in as a different user
2) After I connect to Oracle, I create a table named test_tab. This table will be accessible by other users. Then I create a trigger on the table.
create or replace trigger trig_test
for insert on TESTER.test_tab
Do I need to use the prefix TESTER in the trigger so that it will be accessible to other users? No, you don't need to use the schema qualifier if TESTER will be the owner of the trigger.
Justin

How to save library symbols' class files in packages that are not the default package?

Hi,
I perform the following in Flash CS5 with Flash Builder 4
1) Create a new library symbol.
2) Do a RightClick->Properties on the new symbol
3) Check the options for "Export for ActionScript" and "Export in frame 1".
4) I write a new name for my class "Class1" and click on the pencil icon "edit class definition" to edit the class.
At this point my FlashBuilder 4 takes over and opens the "New ActionScript" dialog.
4) I then click on Package-Browse to select a package e.g. com.mycompany.myfiles as the new class destination.
The as file is created as com.mycompany.myfiles/Class1.as as everything seems just fine.
5) I close the ActionScript file and back in Flash CS5 I RightClick on the symbol and select "Edit Class".
At this time, FB4 suggests again to create the file, ignoring the fact that I already created it before.
Do you know of a way I can make Flash CS5 remember where I created the file?
Thanks.

Hi,
I didn't remove the project or delete any of the files.
All I did was create the class file under a package that is not the default package. Then when I clicked on the Flash symbol's "Edit Class" It asked me again to create the same class file.
Only if I create the class in the default package, it won't ask me to recreate it again.
Bye,
RaamEE-IL

13 default packages in JSP

Can anybody tell what are the 13 default packages in JSP.
Thanks in advance!!!

not entirely sure what you mean but the following are imported implicitly in all JSPs:
java.lang.*
javax.servlet.*
javax.servlet.jsp.*
javax.servlet.http.* hth,
m

Importing classes from default package

hey all,
I've just started a new job, and find myself having to use a library that is written in the default package. At the moment, this is forcing me to put my classes in the default package whenever I want to use this library.
using a line like:
import RowBean;
I get the following compiler error:
    [javac] C:\work\coyote\src\java\com\sok\coyote\Grievance\GrievanceActionServlet.java:8: '.' expected
    [javac] import RowBean;I've tried classic,modern and jikes - all with the same error.
Eclipse seems to compile this happily, but I've been unable to find what it does to compile it.
any ideas?
cheers
dim

This works for me in 1.3.1_07
DefaultPackage
public class UseMe
     public static final String test = "Yes";
}Package = fun
package fun;
import UseMe;
public class Fun
     public static void main( String[] args )
          System.out.println( UseMe.test );
}

Access default package

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