src/macosx/classes/sun/lwawt/macosx/CDataTransferer.java
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@@ -180,11 +180,15 @@
synchronized protected Long getFormatForNativeAsLong(String str) {
Long format = predefinedClipboardNameMap.get(str);
if (format == null) {
- format = new Long(registerFormatWithPasteboard(str));
+ if (java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment().isHeadlessInstance()) {
+ // Do not try to access native system for the unknown format
+ return -1L;
+ }
+ format = registerFormatWithPasteboard(str);
predefinedClipboardNameMap.put(str, format);
predefinedClipboardFormatMap.put(format, str);
}
return format;