Hashmap in Spring form

Question

I use the following input tag where entry is an entry of myMap.

<form:input path="myMap[${entry.key}].parameters[${counter}].value" />

and following objects

Map<Long, MyViewModel> myMap;

public class MyViewModel {
private List<My2ViewModel> parameters;
...

If the value of entry.key is an integer, everything works prefectly. But if it is a long (ex. 5000000000) it crashes

org.springframework.expression.spel.SpelParseException: EL1035E:(pos 14): The value '5000000000' cannot be parsed as an int
at org.springframework.expression.spel.ast.Literal.getIntLiteral(Literal.java:79)
at org.springframework.expression.spel.standard.InternalSpelExpressionParser.maybeEatLiteral(InternalSpelExpressionParser.java:688)
at org.springframework.expression.spel.standard.InternalSpelExpressionParser.eatStartNode(InternalSpelExpressionParser.java:429)
at org.springframework.expression.spel.standard.InternalSpelExpressionParser.eatPrimaryExpression(InternalSpelExpressionParser.java:282)
at org.springframework.expression.spel.standard.InternalSpelExpressionParser.eatUnaryExpression(InternalSpelExpressionParser.java:275)
...
Caused by: java.lang.NumberFormatException: For input string: "5000000000"

When I add an L (suggestion of Stephen), I get an other error.

<form:input path="myMap[${entry.key}L].parameters[${counter}].value" />

java.lang.IllegalArgumentException: The field type is required
at org.springframework.util.Assert.notNull(Assert.java:112)
at org.springframework.webflow.mvc.view.ConvertingPropertyEditorAdapter.<init>(ConvertingPropertyEditorAdapter.java:48)
at org.springframework.webflow.mvc.view.BindingModel.findSpringConvertingPropertyEditor(BindingModel.java:277)
at org.springframework.webflow.mvc.view.BindingModel.findEditor(BindingModel.java:183)
at org.springframework.web.servlet.support.BindStatus.<init>(BindStatus.java:125)
at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.getBindStatus(AbstractDataBoundFormElementTag.java:179)
at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.getPropertyPath(AbstractDataBoundFormElementTag.java:199)
at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.getName(AbstractDataBoundFormElementTag.java:165)
at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.autogenerateId(AbstractDataBoundFormElementTag.java:152)
at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.resolveId(AbstractDataBoundFormElementTag.java:143)
at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.writeDefaultAttributes(AbstractDataBoundFormElementTag.java:127)
at org.springframework.web.servlet.tags.form.AbstractHtmlElementTag.writeDefaultAttributes(AbstractHtmlElementTag.java:421)
at org.springframework.web.servlet.tags.form.InputTag.writeTagContent(InputTag.java:142)
...

Answer 1

The number 5,000,000,000 is larger than the largest possible value for a Java int. Now it looks like you actually want an long value, but unfortunately the Spring documentation says this:

"The types of literal expressions supported are strings, dates, numeric values (int, real, and hex), boolean and null."

No mention of long.

Reference: Spring Expression Language - specifically section 6.5.1.

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You might "get lucky" by using the Java syntax for a long literal - 5000000000L - but I doubt that it will work.