pentaho/pentaho-kettle · warning · IllegalArgumentException

Invalid zoom value

Error message

Invalid zoom value

What it means

TransGraph's zoom label handler parses the entered text as a percentage (/100) into a magnification. On a parse failure or an out-of-range magnification (outside MIN_ZOOM..MAX_ZOOM) it restores the previous magnification, logs 'Invalid zoom value', throws IllegalArgumentException internally, and the catch block shows the 'InvalidZoomMeasurement' dialog.

Solutions

1. Type a plain numeric percentage within the supported zoom range (e.g. '150%').
2. Remove any non-numeric characters or duplicate decimal points.
3. Pick a value from the zoom preset drop-down rather than free text.

Example fix

// before
String possibleText = "abc"; // unparsable
// after
String possibleText = "150"; // 1.5x magnification, in range

float m;
try { m = Float.parseFloat( text ) / 100; } catch ( NumberFormatException e ) { m = -1; }
if ( m < MIN_ZOOM || m > MAX_ZOOM ) { /* reject and restore previousMagnification */ }

try {
  applyZoom( possibleText );
} catch ( Exception e ) {
  magnification = previousMagnification;
  modalMessageDialog( getString( "TransGraph.Dialog.InvalidZoomMeasurement.Title" ),
                      getString( "TransGraph.Dialog.InvalidZoomMeasurement.Message" ) );
}

When it happens

Trigger: Typing a non-numeric string or a zoom value whose /100 result is below MIN_ZOOM or above MAX_ZOOM into the TransGraph zoom label and confirming it.

Common situations: Typos like '25o%' or '1.5.0'; entering '1000%' when the max zoom is lower; pasting values copied from other tools with different zoom semantics.

Understand the failure class

Background: "Must be a positive integer", "Invalid value", "Unsupported": the invalid-argument-value error family, when a library rejects the value you pass — this error's family across 35 libraries.

Related errors

• TransGraph.Dialog.InvalidZoomMeasurement.Message
• AccessInputMeta.Exception.FileDoesNotExist
• AccessOutputMeta.Exception.FileDoesNotExist
• Alert dialog cancelled by user.
• Cannot load dialog due to error in initialization.

AI-assisted analysis of pentaho/pentaho-kettle@f3058517a1 (2026-09-13). Data as JSON: /api/errors/0f4ee34b479517f5. Report an issue: GitHub.

Appendix: source

Thrown at ui/src/main/java/org/pentaho/di/ui/spoon/trans/TransGraph.java:1900

    }
  }

  /**
   * Allows for magnifying to any percentage entered by the user...
   */
  private void readMagnification() {
    float previousMagnification = magnification;
    String possibleText = zoomLabel.getText();
    possibleText = possibleText.replace( "%", "" );

    float possibleFloatMagnification;
    try {
      possibleFloatMagnification = Float.parseFloat( possibleText ) / 100;
      magnification = possibleFloatMagnification;
      if ( magnification < MIN_ZOOM || magnification > MAX_ZOOM ) {
        magnification = previousMagnification;
        log.logError( "Invalid zoom value: " + zoomLabel.getText() );
        throw new IllegalArgumentException( );
      }
      if ( zoomLabel.getText().indexOf( '%' ) < 0 ) {
        zoomLabel.setText( zoomLabel.getText().concat( "%" ) );
      }
    } catch ( Exception e ) {
      modalMessageDialog( getString( "TransGraph.Dialog.InvalidZoomMeasurement.Title" ),
        getString( "TransGraph.Dialog.InvalidZoomMeasurement.Message", String.valueOf( (int) ( MIN_ZOOM * 100 ) ), String.valueOf( (int) MAX_ZOOM * 100 ) ),
        SWT.YES | SWT.ICON_ERROR );
    }
    redraw();
  }

  protected void hideToolTips() {
    toolTip.hide();
    helpTip.hide();
    toolTip.setHideDelay( TOOLTIP_HIDE_DELAY_SHORT );
  }

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