StringBuilder recycledStringBuilder = new StringBuilder(INTIAL_STRING_BUILDER_SIZE);
...
protected String writeLoopOnConverters(E event) \{
        StringBuilder strBuilder = getRecycledStringBuilder();
...
}

    private StringBuilder getRecycledStringBuilder() \{
        if (recycledStringBuilder.length() > MAX_STRING_BUILDER_LENGTH) \{
            recycledStringBuilder = new StringBuilder(INTIAL_STRING_BUILDER_SIZE);
        }
        recycledStringBuilder.setLength(0);
        return recycledStringBuilder;
    }