java - JTable grid lines disappear unexpectedly -

i have s (very s) scce illustrates problem: there jtable , jtree both contained in jpanel borderlayout. of grid lines in jtable show, not 1 @ left, , not 1 @ top. have tried experimenting borders, placing jtable on own dedicated jpanel, etc.

i have gleaned experts bad idea call of setxxxsize methods, have not resorted setpreferredsize, example. in sscce can swap tree , table positions round uncommenting "east" line)

how make these obscured/missing gridlines reappear?

(nb idea table grow/shrink dynamically jtree, there same number of rows in table , tree... hence desire contain both components on same jpanel).

sscce:

import java.awt.*; import java.lang.reflect.invocationtargetexception; import javax.swing.*; import javax.swing.border.lineborder;   public class tablegridprob {     public static void main( string[] args ) throws interruptedexception, invocationtargetexception{          eventqueue.invokeandwait( new runnable(){              @override       public void run() {           jframe frame = new jframe( "table grid prob" );           frame.setsize( 800, 300 );           frame.setvisible( true );           jsplitpane split_pane = new jsplitpane();           jscrollpane split_jsp = new jscrollpane( split_pane );           jpanel left_panel = new jpanel();           left_panel.setlayout( new borderlayout() );           jtree jt = new jtree();           jt.setrowheight( 20 );           left_panel.add( jt, borderlayout.west ); //        left_panel.add( jt, borderlayout.east );            jtable jtable = new jtable( 4, 1  );  //        jtable.setborder( new lineborder( color.green, 3 ));            jtable.setrowheight( 20 );           left_panel.add( jtable, borderlayout.center );           split_pane.setleftcomponent( left_panel );           frame.getcontentpane().add( split_jsp );           split_pane.setdividerlocation( 0.5d );        }         });     } } 

later

in answer suggestion have wrap jtable in jscrollpane... doesn't appear solve problem, @ least standard java l&f. have tried various permutations of sitting jtable on jscrollpane on jpanel, sitting jtable on own jpanel , giving latter lineborder, etc. problem appears bit trickier. chief suspects insets , layout managers... 1) neither of getinsets methods of jtable called in course of code 2) maybe borderlayout not ideal. did try gridlayout , boxlayout but, recall, neither of these solved problem...

later

even simpler sscce illustrates prob (cannot see left-hand vertical gridline)

import java.awt.*; import java.lang.reflect.invocationtargetexception; import javax.swing.*;   public class tablegridprob2 {   public static void main( string[] args ) throws interruptedexception, invocationtargetexception{     eventqueue.invokelater( new runnable(){       @override       public void run() {         jframe frame = new jframe( "table grid prob2" );         frame.setdefaultcloseoperation(jframe.exit_on_close);         jscrollpane sp = new jscrollpane( new jtable( 20, 5 ));         frame.getcontentpane().add( sp );         frame.pack();         frame.setvisible( true );       }     });   } } 

* later (6 sep) *

screenshots 2 sscces:

hope can see problem: missing vertical left-hand gridline (and top gridline appears) in both cases...

a few notes reference:

• i've incorporated @reimeus' suggestion, i'm not sure want.

• i'm sure border merely illustrative, note api authors, "recommend put component in jpanel , set border on jpanel." in particular, green border obscures part of first table row.

• note gridlines belong ui delegate, shown here; if critical, plan test on each target l&f.

• unless have specific reason wait on initial thread, use invokelater().

• if jtable dominates initial appearance, overriding scrollable interface method getpreferredscrollableviewportsize() reasonable compromise of general guidelines here.

• use pack() leverage component's preferred size.

• make setvisible() last.

addendum: based on update, tablegridprob2, added colored border enclosing panel see better. indeed, com.apple.laf.aquatableui leaves one-pixel left margin, presumably selection rectangle. might try chosen l&f.

import java.awt.*; import javax.swing.*; import javax.swing.border.lineborder; import javax.swing.plaf.coloruiresource;  public class tablegridprob2 {      public static void main(string[] args) {         uimanager.put("table.gridcolor", new coloruiresource(color.gray));         eventqueue.invokelater(new runnable() {             @override             public void run() {                 jframe frame = new jframe("table grid prob2");                 frame.setdefaultcloseoperation(jframe.exit_on_close);                 jscrollpane sp = new jscrollpane(new jtable(20, 5));                 jpanel p = new jpanel(new gridlayout());                 p.setborder(new lineborder(color.green, 4));                 p.add(sp);                 frame.getcontentpane().add(p);                 frame.pack();                 frame.setvisible(true);             }         });     } } 

import java.awt.*; import javax.swing.*; import javax.swing.border.lineborder; import javax.swing.plaf.coloruiresource;  public class tablegridprob {      public static void main(string[] args) {         uimanager.put("table.gridcolor", new coloruiresource(color.gray));         eventqueue.invokelater(new runnable() {             @override             public void run() {                 jframe frame = new jframe("table grid prob");                 frame.setdefaultcloseoperation(jframe.exit_on_close);                  jpanel leftpanel = new jpanel(new borderlayout());                 jtree jt = new jtree();                 jt.expandrow(1);                 leftpanel.add(jt, borderlayout.west);                 jtable table = new jtable(20, 1) {                     @override                     public dimension getpreferredscrollableviewportsize() {                         return new dimension(300, 200);                     }                 };                 table.setborder(new lineborder(color.green, 4));                 table.settableheader(null);                 leftpanel.add(new jscrollpane(table), borderlayout.center);                  jsplitpane splitpane = new jsplitpane();                 splitpane.setleftcomponent(leftpanel);                 frame.add(splitpane);                 frame.pack();                 frame.setlocationbyplatform(true);                 frame.setvisible(true);             }         });     } }