About null

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Tutorial
6

Step 4: Add a Servlet Class

a new guest: String name = request.getParameter("name"); if (name != null
Tutorial
6

Step 4: Add a Servlet Class

"); if (name != null) guestDao.persist(new Guest(name)); // Display
Tutorial
6

Step 5: Add a JSP Page

> guests = (List)request.getAttribute("guests"); if (guests != null
Tutorial
6

Step 5: Add a JSP Page

"); if (guests != null) { for (Guest guest : guests
Result
6

ObjectDB Object Database Features

operators (<, <=, >=, <>, =, !=, ==, BETWEEN, IS NULL). Logical operators (AND, OR, NOT
JDO Doc
6

javax.jdo.JDOException

() Returns the cause of this throwable or null if the cause is nonexistent or unknown. Returns the cause of this throwable or null if the cause is nonexistent or unknown. (The cause is the throwable ... of a throwable. Returns: the cause of this throwable or null if the cause is nonexistent or unknown
JPA Doc
6

javax.persistence.criteria.CriteriaBuilder.Coalesce

is equivalent to a case expression that returns null if all its arguments evaluate to null, and the value of its first non-null argument otherwise. Since: JPA 2.0 Selection alias(String name) Assigns ... or null, if no alias has been assigned. Return the alias assigned to the tuple element or null
Result
6

java.lang.RuntimeException

the cause of this throwable or null if the cause is nonexistent or unknown. Returns the cause of this throwable or null if the cause is nonexistent or unknown. (The cause is the throwable that caused ... of a throwable. Returns: the cause of this throwable or null if the cause is nonexistent or unknown
JDO Doc
6

javax.jdo.JDOCanRetryException

. Returns: the detail message string of this Throwable instance (which may be null). Since: Java ... : NullPointerException - if stackTrace is null, or if any of the elements of stackTrace are null Since: Java 1.4 Throwable getCause() Returns the cause of this throwable or null if the cause is nonexistent or
JDO Doc
6

javax.jdo.JDODataStoreException

string of this Throwable instance (which may be null). Since: Java JDK1.0 Throwable ... is null, or if any of the elements of stackTrace are null Since: Java 1.4 Throwable getCause() Returns the cause of this throwable or null if the cause is nonexistent or unknown. Returns the cause