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ipp-client use cases written in java or kotlin with build support for gradle and maven, bonjour discovery

Kotlin 71.94% Java 27.68% Shell 0.38%
ipp-protocol cups java kotlin printing bonjour-discovery airprint

ipp-samples's Issues

can't no find contentType

I used HP PageWide MFP P57750 - J9V82D run this java samples ๏ผŒ can't find contentType in IppClient.kt:102 ,why?

what should I do?

Exception in thread "main" java.lang.NullPointerException
	at de.gmuth.ipp.client.IppClient.exchange(IppClient.kt:102)
	at de.gmuth.ipp.client.IppClient.exchangeSuccessful(IppClient.kt:67)
	at de.gmuth.ipp.client.IppPrinter.exchangeSuccessful(IppPrinter.kt:250)
	at de.gmuth.ipp.client.IppPrinter.getPrinterAttributes(IppPrinter.kt:140)
	at de.gmuth.ipp.client.IppPrinter.getPrinterAttributes$default(IppPrinter.kt:138)
	at de.gmuth.ipp.client.IppPrinter.updateAllAttributes(IppPrinter.kt:144)
	at de.gmuth.ipp.client.IppPrinter.<init>(IppPrinter.kt:28)
	at de.gmuth.ipp.client.IppPrinter.<init>(IppPrinter.kt:24)
	at de.gmuth.ipp.client.IppPrinter.<init>(IppPrinter.kt:37)
	at ipp.PrinterAttributes.main(PrinterAttributes.java:9)

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