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Id
2618919
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2010-04-11T22:17:02.107
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2010-04-11T22:29:09.147
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2010-04-11T22:29:09.147
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231211
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231211
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2247302
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2
Score
3
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text
Body
Using <a href="http://static.springsource.org/spring/docs/3.0.x/spring-framework-reference/html/expressions.html" rel="nofollow noreferrer">Spring EL</a> and <a href="http://static.springsource.org/spring-security/site/docs/3.0.x/reference/el-access.html" rel="nofollow noreferrer">Spring security</a> could get you most of the way. Spring security defines the @PreAuthorize annotation which is fired before method invocation and allows you to use Spring 3's new expression engine, such as: <pre><code>@PreAuthorize("#customerId > 0") public Customer getCustomer(int customerId) { .. } </code></pre> or far more advanced rules like the following which ensures that the passed user does not have role ADMIN. <pre><code>@PreAuthorize("#user.role != T(com.company.Role).ADMIN)") public void saveUser(User user) { .. } </code></pre> You can also provide default values for your contract with the @Value annotation <pre><code>public Customer getCustomer(@Value("#{434}") int customerId) { .. } </code></pre> You can even reference system properties in your value expressions. Setting up Spring security for this purpose is not to hard as you can just create a <a href="http://static.springsource.org/spring-security/site/docs/3.0.x/apidocs/org/springframework/security/core/userdetails/UserDetailsService.html" rel="nofollow noreferrer">UserDetailsService</a> that grants some default role to all users. Alternatively you could make you own custom Spring aspect and then let this use the <a href="http://static.springsource.org/spring/docs/3.0.0.RC2/javadoc-api/org/springframework/expression/spel/standard/SpelExpressionParser.html" rel="nofollow noreferrer">SpelExpressionParser</a> to check method values. 
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1. POSpring Design By Contract: where to start?
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1. USLars Tackmann
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1. USLars Tackmann
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