Github user richardcloudsoft commented on a diff in the pull request:

    https://github.com/apache/incubator-brooklyn/pull/639#discussion_r30224760
  
    --- Diff: 
locations/jclouds/src/main/java/brooklyn/location/jclouds/JcloudsLocation.java 
---
    @@ -1050,42 +1050,59 @@ public void apply(TemplateOptions t, ConfigBag 
props, Object v) {
                         public void apply(TemplateOptions t, ConfigBag props, 
Object v) {
                             t.networks((String)v);
                         }})
    -              .put(TEMPLATE_OPTIONS, new CustomizeTemplateOptions() {
    -                  @Override
    -                  public void apply(TemplateOptions options, ConfigBag 
config, Object v) {
    -                      if (v == null) return;
    -                      @SuppressWarnings("unchecked") Map<String, String> 
optionsMap = (Map<String, String>) v;
    -                      if (optionsMap.isEmpty()) return;
    -
    -                      Class<? extends TemplateOptions> clazz = 
options.getClass();
    -                      Iterable<Method> methods = 
Arrays.asList(clazz.getMethods());
    -                      for(final Map.Entry<String, String> option : 
optionsMap.entrySet()) {
    -                          Optional<Method> methodOptional = 
Iterables.tryFind(methods, new Predicate<Method>() {
    -                              @Override
    -                              public boolean apply(@Nullable Method input) 
{
    -                                  // Matches a method with the expected 
name, and a single parameter that TypeCoercions
    -                                  // can coerce to
    -                                  if (input == null) return false;
    -                                  if 
(!input.getName().equals(option.getKey())) return false;
    -                                  Type[] parameterTypes = 
input.getGenericParameterTypes();
    -                                  return parameterTypes.length == 1
    -                                          && 
TypeCoercions.tryCoerce(option.getValue(), 
TypeToken.of(parameterTypes[0])).isPresentAndNonNull();
    -                              }
    -                          });
    -                          if(methodOptional.isPresent()) {
    -                              try {
    -                                  Method method = methodOptional.get();
    -                                  method.invoke(options, 
TypeCoercions.coerce(option.getValue(), 
TypeToken.of(method.getGenericParameterTypes()[0])));
    -                              } catch (IllegalAccessException e) {
    -                                  throw Exceptions.propagate(e);
    -                              } catch (InvocationTargetException e) {
    -                                  throw Exceptions.propagate(e);
    -                              }
    -                          } else {
    -                              LOG.warn("Ignoring request to set template 
option {} because this is not supported by {}", new Object[] { option.getKey(), 
clazz.getCanonicalName() });
    -                          }
    -                      }
    -                  }
    +            .put(TEMPLATE_OPTIONS, new CustomizeTemplateOptions() {
    +                @Override
    +                public void apply(TemplateOptions options, ConfigBag 
config, Object v) {
    +                    if (v == null) return;
    +                    @SuppressWarnings("unchecked") Map<String, Object> 
optionsMap = (Map<String, Object>) v;
    +                    if (optionsMap.isEmpty()) return;
    +
    +                    Class<? extends TemplateOptions> clazz = 
options.getClass();
    +                    Iterable<Method> methods = 
Arrays.asList(clazz.getMethods());
    +                    for(final Map.Entry<String, Object> option : 
optionsMap.entrySet()) {
    +                        Optional<Method> methodOptional = 
Iterables.tryFind(methods, new Predicate<Method>() {
    +                            @Override
    +                            public boolean apply(@Nullable Method input) {
    +                                // Matches a method with the expected 
name, and a single parameter that TypeCoercions
    +                                // can coerce to
    +                                if (input == null) return false;
    +                                if 
(!input.getName().equals(option.getKey())) return false;
    +                                int numOptionParams = option.getValue() 
instanceof List ? ((List)option.getValue()).size() : 1;
    +                                Type[] parameterTypes = 
input.getGenericParameterTypes();
    +                                if (parameterTypes.length != 
numOptionParams) return false;
    +                                if (numOptionParams == 1 && 
!(option.getValue() instanceof List) && parameterTypes.length == 1) {
    +                                    return true;
    +                                }
    +                                for (int paramCount = 0; paramCount < 
numOptionParams; paramCount ++) {
    +                                    if 
(!TypeCoercions.tryCoerce(((List)option.getValue()).get(paramCount),
    +                                            
TypeToken.of(parameterTypes[paramCount])).isPresentAndNonNull()) return false;
    +                                }
    +                                return true;
    +                            }
    +                        });
    +                        if(methodOptional.isPresent()) {
    +                            try {
    +                                Method method = methodOptional.get();
    +                                if (option.getValue() instanceof List) {
    +                                    List<Object> parameters = 
Lists.newArrayList();
    +                                    int numOptionParams = 
((List)option.getValue()).size();
    +                                    for (int paramCount = 0; paramCount < 
numOptionParams; paramCount++) {
    +                                        
parameters.add(TypeCoercions.coerce(((List)option.getValue()).get(paramCount), 
TypeToken.of(method.getGenericParameterTypes()[paramCount])));
    +                                    }
    +                                    method.invoke(options, 
parameters.toArray());
    +                                } else {
    +                                    method.invoke(options, 
TypeCoercions.coerce(option.getValue(), 
TypeToken.of(method.getGenericParameterTypes()[0])));
    +                                }
    +                            } catch (IllegalAccessException e) {
    +                                throw Exceptions.propagate(e);
    +                            } catch (InvocationTargetException e) {
    +                                throw Exceptions.propagate(e);
    +                            }
    +                        } else {
    +                            LOG.warn("Ignoring request to set template 
option {} because this is not supported by {}", new Object[] { option.getKey(), 
clazz.getCanonicalName() });
    +                        }
    +                    }
    +                }
    --- End diff --
    
    Is there any unexpected behaviour here if the template option you want to 
set here takes a single parameter that is a `List`?


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