how to fix Error RuntimeException: Unable to start service on a null object reference when use System.exit(0);
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What is a NullPointerException, and how do I fix it?
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What can cause "System.CalloutException: You have uncommitted work pending. Please commit or rollback before calling out"?
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System.NullPointerException: Attempt to de-reference a null object
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Caught Throwable or Exception is null
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Java: Exception itself is null
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java.lang.NullPointerException at javax.faces.webapp.UIComponentClassicTagBase.setJspId
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Error: Unable to generate a temporary class (result=1) ... When Invoking Methods on a Web Service
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Why does String.valueOf(null) throw a NullPointerException?
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InputStream returning NullPointerException (Java)
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Compiler warning: null reference exception
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Is using NULL references OK?
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Use cases for Object.create(null)
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RuntimeException: Unable to instantiate application
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How to debug NullPointerException in selenium-java
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Does setting Java objects to null do anything anymore?
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"Unable to cast object of type 'System.Byte[]' to type 'System.IConvertible'." error in Photo: why and how do I fix it?
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NullPointerException in Java with no StackTrace