OBERWEIS ASSET MANAGEMENT INC /IL/ /ADV
SC 13G, 1999-02-10
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<PAGE>
 
                                 UNITED STATES
                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C. 20549

                                 SCHEDULE 13G

                   Under the Securities Exchange Act of 1934
                   (Amendment No._________________)*

                             Javelin Systems, Inc.
- --------------------------------------------------------------------------------
                               (Name of Issuer)

                                 Common Stock
- --------------------------------------------------------------------------------
                        (Title of Class of Securities)

                                   471896100
- --------------------------------------------------------------------------------
                                (CUSIP Number)

*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter the
disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).

                               Page 1 of 7 pages
<PAGE>

- ---------------------                                    ---------------------
 CUSIP No. 471896100                  13G                  Page 2 of 7 Pages
- ---------------------                                    ---------------------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                                                                                
          Oberweis Asset Management, Inc.
                          
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [_]
      Not Applicable                                            (b) [_]
                                                 
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 

- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 4                                 
          Illinois

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5                                                       
     NUMBER OF               None        
 
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6       
                             274,200
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7       
    REPORTING                None
 
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8       
                             274,200
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9                           
          274,200
- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10    
          Not Applicable
 
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
11           
          6.7%                    

- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
12           
          IA

- ------------------------------------------------------------------------------
                      *SEE INSTRUCTION BEFORE FILLING OUT!
<PAGE>
 
- ---------------------                                    ---------------------
 CUSIP No. 471896100                  13G                  Page 3 of 7 Pages
- ---------------------                                    ---------------------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                                                                                
          James D. Oberweis 
                          
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [_]
      Not Applicable                                            (b) [_]
                                                 
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 

- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 4                                 
          U.S.A.

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5                                                       
     NUMBER OF               None        
 
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6       
                             274,200
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7       
    REPORTING                None
 
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8       
                             274,200
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9                           
          274,200
- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10    
          Not Applicable
 
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
11           
          6.7%                    

- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
12           
          IN

- ------------------------------------------------------------------------------
                      *SEE INSTRUCTION BEFORE FILLING OUT!
<PAGE>
 
Item 1(a)      Name of Issuer:

                    Javelin Systems, Inc.

Item 1(b)      Address of Issuer's Principal Executive Offices:

                    1881 Langley Avenue
                    Irvine, CA 92614-5138

Item 2(a)      Name of Person Filing:

                    Oberweis Asset Management, Inc. ("OAM");
                    James D. Oberweis ("Mr. Oberweis")

Item 2(b)      Address of Principal Business Office:

                    OAM, and Mr. Oberweis are both located at:
                    951 Ice Cream Drive, Suite 200
                    North Aurora, Illinois 60542

Item 2(c)      Citizenship:

                    OAM is an Illinois Corporation.
                    Mr. Oberweis is a U.S. citizen.

Item 2(d)      Title of Class of Securities:

                    Common Stock

Item 2(e)      CUSIP Number:

                    471896100

Item 3         Type of Person:

               (e)  OAM is an Investment Advisor registered under section 203 of
                    the Investment Advisors Act of 1940. Mr. Oberweis is the
                    principal stockholder of OAM.

                               Page 4 of 7 pages
<PAGE>
 
Item 4         Ownership (at December 31, 1998):

                    (a)  Amount owned "beneficially" within the meaning of rule
                         13d-3:

                         274,200 shares

                    (b)  Percent of class:

                         6.7% (based on 4,112,000 shares outstanding on December
                         31, 1998)

                    (c)  Number of shares as to which such person has:

                              (i) sole power to vote or to direct the vote: none
                             (ii) shared power to vote or to direct the vote:
                                  274,200
                            (iii) sole power to dispose or to direct the
                                  disposition of: none
                             (iv) shared power to dispose or to direct 
                                  disposition of: 274,200

                    OAM serves as investment advisor to The Oberweis Funds (the
                    "Fund").  Various of OAM's shareholders and employees are
                    also officers and trustees of the Fund, but OAM does not
                    consider the Fund to be controlled by such persons.
                    Although the Fund is not controlled by OAM, pursuant to Rule
                    16d-3(a) the 100,000 shares beneficially owned by the Fund,
                    with respect to which the Fund has delegated to OAM shared
                    voting power and shared dispositive power, are considered to
                    be shares beneficially owned by OAM by reason of such
                    delegated powers.  In addition to the shares beneficially
                    owned by the Fund, other clients of OAM may own shares which
                    are not included in the aggregate number of shares reported
                    herein because OAM does not have or share voting or
                    investment power over those shares.

Item 5         Ownership of Five Percent or Less of a Class:

                    Not Applicable.

Item 6         Ownership of More than Five Percent on Behalf of Another Person:

                    The shares reported herein have been acquired on behalf of
                    discretionary clients of OAM. Persons other than OAM are
                    entitled to receive all dividends from, and proceeds from
                    the sale of, those shares.

Item 7         Identification and Classification of the Subsidiary Which 
               Acquired the Security Being Reported on by the Parent Holding 
               Company:

                    Not Applicable

                               Page 5 of 7 pages
<PAGE>
 
Item 8         Identification and Classification of Members of the Group:

                    Not Applicable

Item 9         Notice of Dissolution of Group:

                    Not Applicable

Item 10        Certification:

                    By signing below I certify that, to the best of my knowledge
               and belief, the securities referred to above were acquired in the
               ordinary course of business and were not acquired for the purpose
               of and do not have the effect of changing or influencing the
               control of the issuer of such securities and were not acquired in
               connection with or as a participant in any transaction having
               such purpose or effect.

                               Page 6 of 7 pages
<PAGE>
 
                                   Signature
                                   ---------

     After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.

Date: February 10, 1999

               The undersigned corporation, on the date above written, agrees
               and consents to the joint filing on its behalf of this Schedule
               13G in connection with its beneficial ownership of the security
               reported herein.



                                 Oberweis Asset Management, Inc.

                                 By:  /s/ Patrick B. Joyce
                                    --------------------------------------
                                          Patrick B. Joyce
                                          Executive Vice President

               The undersigned individual, on the date above written, agrees and
               consents to the joint filing on his behalf of this Schedule 13G
               in connection with his beneficial ownership of the security
               reported herein.




                                       /s/ James D. Oberweis
                                   ---------------------------------------
                                       James D. Oberweis

                               Page 7 of 7 pages


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