org.thymeleaf.exceptions.TemplateProcessingException: Exception evaluating OGNL expression

When you work with Thymeleaf application, you would have encountered the TemplateProcessingException exceptions. The problem is the use of default context variables. It could be because of

1. Wrong use of the context variable name (or)
2. The property name accessed by the context variable object is not correct.

org.thymeleaf.exceptions.TemplateProcessingException: Exception evaluating OGNL expression: "#httpSession.sessionValue" (thymeleaf:11)
at org.thymeleaf.standard.expression.OgnlVariableExpressionEvaluator.evaluate(OgnlVariableExpressionEvaluator.java:126)
at org.thymeleaf.standard.expression.VariableExpression.executeVariable(VariableExpression.java:149)
at org.thymeleaf.standard.expression.SimpleExpression.executeSimple(SimpleExpression.java:59)
at org.thymeleaf.standard.expression.Expression.execute(Expression.java:103)
at org.thymeleaf.standard.expression.Expression.execute(Expression.java:133)
at org.thymeleaf.standard.expression.Expression.execute(Expression.java:120)
at org.thymeleaf.standard.processor.attr.AbstractStandardTextChildModifierAttrProcessor.getText(AbstractStandardTextChildModifierAttrProcessor.java:68)
at org.thymeleaf.processor.attr.AbstractTextChildModifierAttrProcessor.getModifiedChildren(AbstractTextChildModifierAttrProcessor.java:59)
at org.thymeleaf.processor.attr.AbstractChildrenModifierAttrProcessor.processAttribute(AbstractChildrenModifierAttrProcessor.java:58)
at org.thymeleaf.processor.attr.AbstractAttrProcessor.doProcess(AbstractAttrProcessor.java:87)
at org.thymeleaf.processor.AbstractProcessor.process(AbstractProcessor.java:212)
at org.thymeleaf.dom.Node.applyNextProcessor(Node.java:973)
at org.thymeleaf.dom.Node.processNode(Node.java:928)
at org.thymeleaf.dom.NestableNode.computeNextChild(NestableNode.java:672)
at org.thymeleaf.dom.NestableNode.doAdditionalProcess(NestableNode.java:655)
at org.thymeleaf.dom.Node.processNode(Node.java:947)
at org.thymeleaf.dom.NestableNode.computeNextChild(NestableNode.java:672)
at org.thymeleaf.dom.NestableNode.doAdditionalProcess(NestableNode.java:655)
at org.thymeleaf.dom.Node.processNode(Node.java:947)
at org.thymeleaf.dom.NestableNode.computeNextChild(NestableNode.java:672)
at org.thymeleaf.dom.NestableNode.doAdditionalProcess(NestableNode.java:655)
Caused by: ognl.NoSuchPropertyException: org.apache.catalina.session.StandardSessionFacade.sessionValue
at ognl.ObjectPropertyAccessor.getProperty(ObjectPropertyAccessor.java:151)
at ognl.OgnlRuntime.getProperty(OgnlRuntime.java:2334)
at ognl.ASTProperty.getValueBody(ASTProperty.java:114)
at ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:212)
at ognl.SimpleNode.getValue(SimpleNode.java:258)
at ognl.ASTChain.getValueBody(ASTChain.java:141)
at ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:212)
at ognl.SimpleNode.getValue(SimpleNode.java:258)
at ognl.Ognl.getValue(Ognl.java:494)
at ognl.Ognl.getValue(Ognl.java:458)
at org.thymeleaf.standard.expression.OgnlVariableExpressionEvaluator.evaluate(OgnlVariableExpressionEvaluator.java:114)