nullpointerexception - UCanAccess driver throws Exception when trying to connect with Access database while Jackcess connection works fine -

1) ucanaccess sample code works database (access 2000)

class.forname("net.ucanaccess.jdbc.ucanaccessdriver");             connection conn = drivermanager.getconnection(database_url);             system.out.println(conn); 

2) same ucanaccess sample code not work database b (access 2000) , leads exception stack trace:

net.ucanaccess.jdbc.ucanaccesssqlexception     @ net.ucanaccess.jdbc.ucanaccessdriver.connect(ucanaccessdriver.java:247)     @ java.sql.drivermanager.getconnection(drivermanager.java:571)     @ java.sql.drivermanager.getconnection(drivermanager.java:233)     @ xxxxxxxxxx.jdbcaccessconnection.main(jdbcaccessconnection.java:23) caused by: java.lang.nullpointerexception     @ net.ucanaccess.converters.ucanaccesstable.getindexes(ucanaccesstable.java:74)     @ net.ucanaccess.converters.loadjet$tablesloader.loadtableindexesuk(loadjet.java:794)     @ net.ucanaccess.converters.loadjet$tablesloader.createindexesuk(loadjet.java:835)     @ net.ucanaccess.converters.loadjet$tablesloader.loadtables(loadjet.java:921)     @ net.ucanaccess.converters.loadjet$tablesloader.access$3(loadjet.java:919)     @ net.ucanaccess.converters.loadjet.loaddb(loadjet.java:1311)     @ net.ucanaccess.jdbc.ucanaccessdriver.connect(ucanaccessdriver.java:236)     ... 3 more 

3) following jackcess sample code works database b (with ucanaccess not work) , leads following output

        table table = databasebuilder.open(new file(database_file_path)).gettable(tablename);         (column column : table.getcolumns())         {             system.out.println("column " + column);         } 

output:

column textcolumn@9234336[   name: (xxxxxxxxxxxxx) table   type: 0xa (text)   number: 0   length: 100   variablelength: true   compressedunicode: true   textsortorder: sortorder[1033(0)] ] column column@dc8092a[   name: (xxxxxxxxxxxxx) attached   type: 0x1 (boolean)   number: 1   length: 1   variablelength: false ] column textcolumn@47d1ab77[   name: (xxxxxxxxxxxxx) database   type: 0xa (text)   number: 2   length: 100   variablelength: true   compressedunicode: true   textsortorder: sortorder[1033(0)] ] column textcolumn@16503677[   name: (xxxxxxxxxxxxx) path   type: 0xa (text)   number: 3   length: 100   variablelength: true   compressedunicode: true   textsortorder: sortorder[1033(0)] ] 

has idea how ucanaccess work right ? in database b there lot of links other .mdb files

4) ucanaccess error consol shows this:

    please, enter full path access file (.mdb or accdb): c:\users\xxx \desktop\xxx.mdb loaded tables:  loaded queries:  loaded indexes: primary key  on berechtigungen columns: (index,userid) , primary key  on dg_fehler columns: (zaehler) , primary key  on fehlertabelle_sich columns: (fc,bc,sfbereich) , primary key  on fgjg1_fehler columns: (zaehler) , primary key  on grundschulen_lokal columns: (snr) , index unique  on nrw_strassen columns: (id) , primary key  on pwrd columns: (userid) , primary key  on schultr─gerart columns: (schultr─gerart) , primary key  on tabellenzumhost columns: (tabelle) , primary key  on tabellenzumhost_bk columns: (tabelle) , primary key  on tabellenzumhost_weiteretabs columns: (tabelle,weiteretabelle)  , primary key  on userid columns: (userid) , primary key  on userkonv columns: (userid) , primary key  on zfehlertabelle columns: (fc,bc,sfbereich)  net.ucanaccess.jdbc.ucanaccesssqlexception         @ net.ucanaccess.jdbc.ucanaccessdriver.connect(ucanaccessdriver.java:24 7)         @ java.sql.drivermanager.getconnection(unknown source)         @ java.sql.drivermanager.getconnection(unknown source)         @ net.ucanaccess.console.main.main(main.java:151) caused by: java.lang.nullpointerexception         @ net.ucanaccess.converters.ucanaccesstable.getindexes(ucanaccesstable. java:74)         @ net.ucanaccess.converters.loadjet$tablesloader.loadtableindexesuk(loa djet.java:794)         @ net.ucanaccess.converters.loadjet$tablesloader.createindexesuk(loadje t.java:835)         @ net.ucanaccess.converters.loadjet$tablesloader.loadtables(loadjet.jav a:921)         @ net.ucanaccess.converters.loadjet$tablesloader.access$3(loadjet.java: 919)         @ net.ucanaccess.converters.loadjet.loaddb(loadjet.java:1311)         @ net.ucanaccess.jdbc.ucanaccessdriver.connect(ucanaccessdriver.java:23 6)         ... 3 more null drücken sie eine beliebige taste . . . (en: press button continue . . . ) 

please execute using jackcess:

for (string tn : database.gettablenames()) {        system.out.println(tn);           system.out.println(database.gettable(tn));       } 

this may understand , solve. please, give me feedback.