Add more @Nullable parameters based on null usage

Issue: SPR-15540

spring-expression/src/main/java/org/springframework/expression/TypedValue.java

@@ -17,6 +17,7 @@
 package org.springframework.expression;
 
 import org.springframework.core.convert.TypeDescriptor;
+import org.springframework.lang.Nullable;
 import org.springframework.util.ObjectUtils;
 
 /**
@@ -43,7 +44,7 @@ public class TypedValue {
 	 * is inferred from the object, so no generic declarations are preserved.
 	 * @param value the object value
 	 */
-	public TypedValue(Object value) {
+	public TypedValue(@Nullable Object value) {
 		this.value = value;
 		this.typeDescriptor = null;  // initialized when/if requested
 	}
@@ -54,12 +55,13 @@ public class TypedValue {
 	 * @param value the object value
 	 * @param typeDescriptor a type descriptor describing the type of the value
 	 */
-	public TypedValue(Object value, TypeDescriptor typeDescriptor) {
+	public TypedValue(@Nullable Object value, @Nullable TypeDescriptor typeDescriptor) {
 		this.value = value;
 		this.typeDescriptor = typeDescriptor;
 	}
 
 
+	@Nullable
 	public Object getValue() {
 		return this.value;
 	}

spring-expression/src/main/java/org/springframework/expression/common/ExpressionUtils.java

@@ -21,6 +21,7 @@ import org.springframework.expression.EvaluationContext;
 import org.springframework.expression.EvaluationException;
 import org.springframework.expression.TypeConverter;
 import org.springframework.expression.TypedValue;
+import org.springframework.lang.Nullable;
 import org.springframework.util.ClassUtils;
 
 /**
@@ -44,7 +45,7 @@ public abstract class ExpressionUtils {
 	 * of the value to the specified type is not supported
 	 */
 	@SuppressWarnings("unchecked")
-	public static <T> T convertTypedValue(EvaluationContext context, TypedValue typedValue, Class<T> targetType) {
+	public static <T> T convertTypedValue(@Nullable EvaluationContext context, TypedValue typedValue, Class<T> targetType) {
 		Object value = typedValue.getValue();
 		if (targetType == null) {
 			return (T) value;

spring-expression/src/main/java/org/springframework/expression/common/TemplateAwareExpressionParser.java

@@ -24,6 +24,7 @@ import org.springframework.expression.Expression;
 import org.springframework.expression.ExpressionParser;
 import org.springframework.expression.ParseException;
 import org.springframework.expression.ParserContext;
+import org.springframework.lang.Nullable;
 
 /**
  * An expression parser that understands templates. It can be subclassed by expression
@@ -255,7 +256,7 @@ public abstract class TemplateAwareExpressionParser implements ExpressionParser
 	 * @return an evaluator for the parsed expression
 	 * @throws ParseException an exception occurred during parsing
 	 */
-	protected abstract Expression doParseExpression(String expressionString, ParserContext context)
+	protected abstract Expression doParseExpression(String expressionString, @Nullable ParserContext context)
 			throws ParseException;
 
 

spring-expression/src/main/java/org/springframework/expression/spel/CompiledExpression.java

@@ -18,6 +18,7 @@ package org.springframework.expression.spel;
 
 import org.springframework.expression.EvaluationContext;
 import org.springframework.expression.EvaluationException;
+import org.springframework.lang.Nullable;
 
 /**
  * Base superclass for compiled expressions. Each generated compiled expression class
@@ -33,6 +34,6 @@ public abstract class CompiledExpression {
 	 * Subclasses of CompiledExpression generated by SpelCompiler will provide an
 	 * implementation of this method.
 	 */
-	public abstract Object getValue(Object target, EvaluationContext context) throws EvaluationException;
+	public abstract Object getValue(Object target, @Nullable EvaluationContext context) throws EvaluationException;
 
 }

spring-expression/src/main/java/org/springframework/expression/spel/ExpressionState.java

@@ -217,7 +217,7 @@ public class ExpressionState {
 		return null;
 	}
 
-	public TypedValue operate(Operation op, Object left, Object right) throws EvaluationException {
+	public TypedValue operate(Operation op, Object left, @Nullable Object right) throws EvaluationException {
 		OperatorOverloader overloader = this.relatedContext.getOperatorOverloader();
 		if (overloader.overridesOperation(op, left, right)) {
 			Object returnValue = overloader.operate(op, left, right);

spring-expression/src/main/java/org/springframework/expression/spel/SpelParserConfiguration.java

@@ -17,6 +17,7 @@
 package org.springframework.expression.spel;
 
 import org.springframework.core.SpringProperties;
+import org.springframework.lang.Nullable;
 
 
 /**
@@ -62,7 +63,7 @@ public class SpelParserConfiguration {
 	 * @param compilerMode the compiler mode for the parser
 	 * @param compilerClassLoader the ClassLoader to use as the basis for expression compilation
 	 */
-	public SpelParserConfiguration(SpelCompilerMode compilerMode, ClassLoader compilerClassLoader) {
+	public SpelParserConfiguration(@Nullable SpelCompilerMode compilerMode, ClassLoader compilerClassLoader) {
 		this(compilerMode, compilerClassLoader, false, false, Integer.MAX_VALUE);
 	}
 

spring-expression/src/main/java/org/springframework/expression/spel/ast/FormatHelper.java

@@ -19,6 +19,7 @@ package org.springframework.expression.spel.ast;
 import java.util.List;
 
 import org.springframework.core.convert.TypeDescriptor;
+import org.springframework.lang.Nullable;
 import org.springframework.util.ClassUtils;
 
 /**
@@ -60,7 +61,7 @@ public class FormatHelper {
 	 * @return a formatted String suitable for message inclusion
 	 * @see ClassUtils#getQualifiedName(Class)
 	 */
-	public static String formatClassNameForMessage(Class<?> clazz) {
+	public static String formatClassNameForMessage(@Nullable Class<?> clazz) {
 		return (clazz != null ? ClassUtils.getQualifiedName(clazz) : "null");
 	}
 

spring-expression/src/main/java/org/springframework/expression/spel/standard/InternalSpelExpressionParser.java

@@ -117,7 +117,7 @@ class InternalSpelExpressionParser extends TemplateAwareExpressionParser {
 
 
 	@Override
-	protected SpelExpression doParseExpression(String expressionString, ParserContext context) throws ParseException {
+	protected SpelExpression doParseExpression(String expressionString, @Nullable ParserContext context) throws ParseException {
 		try {
 			this.expressionString = expressionString;
 			Tokenizer tokenizer = new Tokenizer(expressionString);

spring-expression/src/main/java/org/springframework/expression/spel/standard/SpelExpressionParser.java

@@ -20,6 +20,7 @@ import org.springframework.expression.ParseException;
 import org.springframework.expression.ParserContext;
 import org.springframework.expression.common.TemplateAwareExpressionParser;
 import org.springframework.expression.spel.SpelParserConfiguration;
+import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 
 /**
@@ -56,7 +57,7 @@ public class SpelExpressionParser extends TemplateAwareExpressionParser {
 	}
 
 	@Override
-	protected SpelExpression doParseExpression(String expressionString, ParserContext context) throws ParseException {
+	protected SpelExpression doParseExpression(String expressionString, @Nullable ParserContext context) throws ParseException {
 		return new InternalSpelExpressionParser(this.configuration).doParseExpression(expressionString, context);
 	}
 

spring-expression/src/main/java/org/springframework/expression/spel/support/StandardEvaluationContext.java

@@ -34,6 +34,7 @@ import org.springframework.expression.TypeComparator;
 import org.springframework.expression.TypeConverter;
 import org.springframework.expression.TypeLocator;
 import org.springframework.expression.TypedValue;
+import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 
 /**
@@ -84,7 +85,7 @@ public class StandardEvaluationContext implements EvaluationContext {
 		this.rootObject = new TypedValue(rootObject, typeDescriptor);
 	}
 
-	public void setRootObject(Object rootObject) {
+	public void setRootObject(@Nullable Object rootObject) {
 		this.rootObject = (rootObject != null ? new TypedValue(rootObject) : TypedValue.NULL);
 	}